Кнопки закрытия на CSS

Вариант 1:

Большая кнопка, которая хорошо подойдет для закрытия полноэкранных модальных окон.

<div class="cl-btn-1">
	<div>
		<span class="left">
			<span class="circle-left"></span>
			<span class="circle-right"></span>
		</span>
		<span class="right">
			<span class="circle-left"></span>
			<span class="circle-right"></span>
		</span>
	</div>
</div>

<div>

</span>

</span>

</div>

.cl-btn-1 {
	margin: 20px;
	position: relative;
    display: flex;
    justify-content: center;
	height: 112px;
}	
.cl-btn-1 div {
	width: 100px;
	height: 100px;
	position: absolute;
	background-image: radial-gradient(#FFF, #BFE2FF);
	border-radius: 50%;
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	border: 6px solid #337AB7;
	cursor: pointer;
}
.cl-btn-1 div > span {
	background-color: #337AB7;
	display: block;
	height: 12px;
	border-radius: 6px;
	position: relative;
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	position: absolute;
	top: 50%;
	margin-top: -6px;
	left: 18px;
	width: 64px;
}
.cl-btn-1 div > span span {
	display: block;
	background-color: #215b8c;
	width: 12px;
	height: 12px;
	border-radius: 6px;
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	position: absolute;
	left: 0;
	top: 0;
}
.cl-btn-1 div > span.left {
	transform: rotate(45deg);
	transform-origin: center;
}
.cl-btn-1 div > span.left .circle-left {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 0;
}
.cl-btn-1 div > span.left .circle-right {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 52px;
}
.cl-btn-1 div > span.right {
	transform: rotate(-45deg);
	transform-origin: center;
}
.cl-btn-1 div > span.right .circle-left {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 0;
}
.cl-btn-1 div > span.right .circle-right {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 52px;
}
.cl-btn-1 div:hover > span {
	background-color: #215b8c;
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
}
.cl-btn-1 div:hover > span span {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	background-color: #337AB7;
}
.cl-btn-1 div:hover > span.left .circle-left {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 52px;
}
.cl-btn-1 div:hover > span.left .circle-right {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 0;
}
.cl-btn-1 div:hover > span.right .circle-left {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 52px;
}
.cl-btn-1 div:hover > span.right .circle-right {
	transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);
	margin-left: 0;
}

.cl-btn-1 {

margin: 20px;

position: relative;

display: flex;

justify-content: center;

height: 112px;

}

.cl-btn-1 div {

width: 100px;

height: 100px;

position: absolute;

background-image: radial-gradient(#FFF, #BFE2FF);

border-radius: 50%;

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

border: 6px solid #337AB7;

cursor: pointer;

}

.cl-btn-1 div > span {

background-color: #337AB7;

display: block;

height: 12px;

border-radius: 6px;

position: relative;

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

position: absolute;

top: 50%;

margin-top: -6px;

left: 18px;

width: 64px;

}

.cl-btn-1 div > span span {

display: block;

background-color: #215b8c;

width: 12px;

height: 12px;

border-radius: 6px;

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

position: absolute;

left: 0;

top: 0;

}

.cl-btn-1 div > span.left {

transform: rotate(45deg);

transform-origin: center;

}

.cl-btn-1 div > span.left .circle-left {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 0;

}

.cl-btn-1 div > span.left .circle-right {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 52px;

}

.cl-btn-1 div > span.right {

transform: rotate(-45deg);

transform-origin: center;

}

.cl-btn-1 div > span.right .circle-left {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 0;

}

.cl-btn-1 div > span.right .circle-right {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 52px;

}

.cl-btn-1 div:hover > span {

background-color: #215b8c;

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

}

.cl-btn-1 div:hover > span span {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

background-color: #337AB7;

}

.cl-btn-1 div:hover > span.left .circle-left {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 52px;

}

.cl-btn-1 div:hover > span.left .circle-right {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 0;

}

.cl-btn-1 div:hover > span.right .circle-left {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 52px;

}

.cl-btn-1 div:hover > span.right .circle-right {

transition: all 0.4s cubic-bezier(0.215, 0.61, 0.355, 1);

margin-left: 0;

}

Вариант 2:

Кнопка с подписью "закрыть" при наведении.

закрыть

<div class="cl-btn-2">
	<div>
		<div class="leftright"></div>
		<div class="rightleft"></div>
		<span class="close-btn">закрыть</span>
	</div>
</div>

<div>

<span class="close-btn">закрыть</span>

</div>

.cl-btn-2 {
    margin: 20px;
    display: flex;
    justify-content: center;
}
.cl-btn-2 div {
	cursor: pointer;
    position: relative;  
	height: 68px;
	width: 50px;
}
.cl-btn-2 .leftright {
	height: 4px;
	width: 50px;
	position: absolute;
	margin-top: 24px;
	background-color: #337AB7;
	border-radius: 2px;
	transform: rotate(45deg);
	transition: all .3s ease-in;
}
.cl-btn-2 .rightleft {
	height: 4px;
	width: 50px;
	position: absolute;
	margin-top: 24px;
	background-color: #337AB7;
	border-radius: 2px;
	transform: rotate(-45deg);
	transition: all .3s ease-in;
}
.cl-btn-2 .close-btn {
	margin: 54px 0 0 -5px;
	position: absolute;
	color: #337AB7;
	font-family: Tahoma, sans-serif;
	font-size: 13px;
	font-weight: bold;
	text-transform: uppercase;
	transition: all .3s ease-in;
	opacity: 0; 
}
.cl-btn-2 div:hover .leftright {
	transform: rotate(-45deg);
	background-color: #000;
}
.cl-btn-2 div:hover .rightleft {
	transform: rotate(45deg);
	background-color: #000;
}
.cl-btn-2 div:hover .close-btn {
	opacity: 1;
}

.cl-btn-2 {

margin: 20px;

display: flex;

justify-content: center;

}

.cl-btn-2 div {

cursor: pointer;

position: relative;

height: 68px;

width: 50px;

}

.cl-btn-2 .leftright {

height: 4px;

width: 50px;

position: absolute;

margin-top: 24px;

background-color: #337AB7;

border-radius: 2px;

transform: rotate(45deg);

transition: all .3s ease-in;

}

.cl-btn-2 .rightleft {

height: 4px;

width: 50px;

position: absolute;

margin-top: 24px;

background-color: #337AB7;

border-radius: 2px;

transform: rotate(-45deg);

transition: all .3s ease-in;

}

.cl-btn-2 .close-btn {

margin: 54px 0 0 -5px;

position: absolute;

color: #337AB7;

font-family: Tahoma, sans-serif;

font-size: 13px;

font-weight: bold;

text-transform: uppercase;

transition: all .3s ease-in;

opacity: 0;

}

.cl-btn-2 div:hover .leftright {

transform: rotate(-45deg);

background-color: #000;

}

.cl-btn-2 div:hover .rightleft {

transform: rotate(45deg);

background-color: #000;

}

.cl-btn-2 div:hover .close-btn {

opacity: 1;

}

Вариант 3:

Кнопка аналогичная предыдущей, но с другим ховер-эффектом

<div class="cl-btn-3">
	<span class="top"></span>
	<span class="bot"></span>
</div>

</div>

.cl-btn-3 {
	width: 26px;
	height: 26px;
	margin: 40px auto;
	position: relative;
	transform: rotate(45deg) scale(2);
}

.cl-btn-3 .top,
.cl-btn-3 .bot {
	display: block;
	background: #337AB7;
	position: absolute;
	top: 50%;
	left: 50%;
	animation-timing-function: cubic-bezier(1, 0, 0, 1);
	animation-iteration-count: 1;
}

.cl-btn-3 .top {
	height: 100%;
	width: 2px;
	margin-left: -1px;
	transform: skewY(45deg);
	top: 0;
}

.cl-btn-3 .bot {
	width: 100%;
	height: 2px;
	margin-top: -1px;
	transform: skewX(-45deg);
	left: 0;
}

@-webkit-keyframes top-out {
	from {
		top: 0%;
		height: 100%;
	}
	to {
		top: 200%;
		height: 0%;
	}
}

@keyframes top-out {
	from {
		top: 0%;
		height: 100%;
	}
	to {
		top: 200%;
		height: 0%;
	}
}
@-webkit-keyframes top-in {
	from {
		top: -100%;
		height: 0%;
	}
	to {
		top: 0%;
		height: 100%;
	}
}
@keyframes top-in {
	from {
		top: -100%;
		height: 0%;
	}
	to {
		top: 0%;
		height: 100%;
	}
}
@-webkit-keyframes bot-out {
	from {
		left: 0%;
		width: 100%;
	}
	to {
		left: 200%;
		width: 0%;
	}
}
@keyframes bot-out {
	from {
		left: 0%;
		width: 100%;
	}
	to {
		left: 200%;
		width: 0%;
	}
}
@-webkit-keyframes bot-in {
	from {
		left: -100%;
		width: 0%;
	}
	to {
		left: 0%;
		width: 100%;
	}
}
@keyframes bot-in {
	from {
		left: -100%;
		width: 0%;
	}
	to {
		left: 0%;
		width: 100%;
	}
}
.cl-btn-3:hover {
	cursor: pointer;
}
.cl-btn-3:hover .top {
	animation: top-out 0.25s forwards, top-in 0.25s forwards 0.25s;
}
.cl-btn-3:hover .bot {
	animation: bot-out 0.25s forwards 0.1s, bot-in 0.25s forwards 0.35s;
}

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.cl-btn-3 {

width: 26px;

height: 26px;

margin: 40px auto;

position: relative;

transform: rotate(45deg) scale(2);

}

.cl-btn-3 .top,

.cl-btn-3 .bot {

display: block;

background: #337AB7;

position: absolute;

top: 50%;

left: 50%;

animation-timing-function: cubic-bezier(1, 0, 0, 1);

animation-iteration-count: 1;

}

.cl-btn-3 .top {

height: 100%;

width: 2px;

margin-left: -1px;

transform: skewY(45deg);

top: 0;

}

.cl-btn-3 .bot {

width: 100%;

height: 2px;

margin-top: -1px;

transform: skewX(-45deg);

left: 0;

}

@-webkit-keyframes top-out {

from {

top: 0%;

height: 100%;

}

to {

top: 200%;

height: 0%;

}

@keyframes top-out {

from {

top: 0%;

height: 100%;

}

to {

top: 200%;

height: 0%;

}

@-webkit-keyframes top-in {

from {

top: -100%;

height: 0%;

}

to {

top: 0%;

height: 100%;

}

@keyframes top-in {

from {

top: -100%;

height: 0%;

}

to {

top: 0%;

height: 100%;

}

@-webkit-keyframes bot-out {

from {

left: 0%;

width: 100%;

}

to {

left: 200%;

width: 0%;

}

@keyframes bot-out {

from {

left: 0%;

width: 100%;

}

to {

left: 200%;

width: 0%;

}

@-webkit-keyframes bot-in {

from {

left: -100%;

width: 0%;

}

to {

left: 0%;

width: 100%;

}

@keyframes bot-in {

from {

left: -100%;

width: 0%;

}

to {

left: 0%;

width: 100%;

}

.cl-btn-3:hover {

cursor: pointer;

}

.cl-btn-3:hover .top {

animation: top-out 0.25s forwards, top-in 0.25s forwards 0.25s;

}

.cl-btn-3:hover .bot {

animation: bot-out 0.25s forwards 0.1s, bot-in 0.25s forwards 0.35s;

}

Вариант 4:

Складывающая в линию кнопка

<div class="cl-btn-4"></div>

1	<div class="cl-btn-4"></div>

.cl-btn-4 {
	width: 120px;
	height: 120px;
	box-shadow: 0px 10 10px 10px rgba(0, 0, 0, 0.25);
	border-radius: 6px;
	background: #337AB7;
	margin: 20px auto;
	position: relative;
	display: block;
	z-index: 200;
	text-indent: -9999px;
	cursor: pointer;
}
.cl-btn-4:before,
.cl-btn-4:after {
	content: '';
	width: 80%;
	height: 6px;
	background: #BFE2FF;
	position: absolute;
	top: 48%;
	left: 10%;
	transform: rotate(45deg);
	transition: all 0.3s ease-out;
}
.cl-btn-4:after {
	transform: rotate(-45deg);
	transition: all 0.3s ease-out;
}
.cl-btn-4:hover:before,
.cl-btn-4:hover:after {
	transform: rotate(180deg);
	background: #FFF; 
}

.cl-btn-4 {

width: 120px;

height: 120px;

box-shadow: 0px 10 10px 10px rgba(0, 0, 0, 0.25);

border-radius: 6px;

background: #337AB7;

margin: 20px auto;

position: relative;

display: block;

z-index: 200;

text-indent: -9999px;

cursor: pointer;

}

.cl-btn-4:before,

.cl-btn-4:after {

content: '';

width: 80%;

height: 6px;

background: #BFE2FF;

position: absolute;

top: 48%;

left: 10%;

transform: rotate(45deg);

transition: all 0.3s ease-out;

}

.cl-btn-4:after {

transform: rotate(-45deg);

transition: all 0.3s ease-out;

}

.cl-btn-4:hover:before,

.cl-btn-4:hover:after {

transform: rotate(180deg);

background: #FFF;

}

Вариант 5:

3D кнопка с ховер-эффектом

<span class='cl-btn-5'>
	<span>
		<span>
		</span>
	</span>
</span>

<span>

</span>

.cl-btn-5 {
	display: block;
	margin: 20px auto 40px auto;
	perspective: 300px;
	width: 75px;
}
.cl-btn-5 * {
	box-sizing: border-box;
}
.cl-btn-5 > span {
	background: #BFE2FF;
	border: none;
	box-shadow: 1px 43px 41px -22px rgba(0, 0, 0, 0.7);
	cursor: pointer;
	display: block;
	transform-style: preserve-3d;
	transition: all 250ms ease-in;
	transform: rotateX(30deg);
	outline: 1px solid transparent;
	padding: 18px;
	position: relative;
	width: 100%;
}
.cl-btn-5 > span:after {
	background: #BFE2FF;
	content: "";
	height: 40%;
	left: 0;
	position: absolute;
	top: 100%;
	transform-origin: 0% 0%;
	transform: rotateX(-90deg);
	transition: all 250ms ease-in;
	width: 100%;
	z-index: -1;
}
.cl-btn-5 > span > span {
	display: block;
	height: 40px;
	position: relative;
	transform: scale(0.9);
	width: 40px;
}
.cl-btn-5 > span > span:before, 
.cl-btn-5 > span > span:after {
	content: "";
	border-radius: 2px;
	display: block;
	width: 85%;
	height: 25%;
	position: absolute;
	top: 37%;
	left: 8%;
	transition: 0.3s;
	background: #337AB7;
	transform: rotate(-45deg);
}
.cl-btn-5 > span > span:after {
	transform: rotate(45deg);
}
.cl-btn-5 > span:hover, 
.cl-btn-5 > span:focus {
	background: #BFE2FF;
	box-shadow: 1px 43px 41px -22px black;
	color: #ED8728;
	transform: rotateX(10deg);
}
.cl-btn-5 > span:hover:after, 
.cl-btn-5 > span:focus:after {
	background: #BFE2FF;
}
.cl-btn-5 > span:hover > span:before, 
.cl-btn-5 > span:hover > span:after, 
.cl-btn-5 > span:focus > span:before, 
.cl-btn-5 > span:focus > span:after {
	width: 62%;
}
.cl-btn-5 > span:hover > span:before, 
.cl-btn-5 > span:focus > span:before {
	transform: rotate(180deg) translate(0, 0);
}
.cl-btn-5 > span:hover > span:after, 
.cl-btn-5 > span:focus > span:after {
	transform: rotate(-180deg) translate(-37.5%, 0);
}
.cl-btn-5 > span:active {
	transform: rotateX(20deg);
}
.cl-btn-5 > span:active > span:before,
.cl-btn-5 > span:active > span:after {
	background: skyblue;
}
.cl-btn-5.active > span > span:before, 
.cl-btn-5.active > span > span:after {
	width: 62%;
}
.cl-btn-5.active > span > span:before {
	transform: rotate(180deg) translate(0, 0);
}
.cl-btn-5.active > span > span:after {
	transform: rotate(-180deg) translate(-37.5%, 0);
}

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.cl-btn-5 {

display: block;

margin: 20px auto 40px auto;

perspective: 300px;

width: 75px;

}

.cl-btn-5 * {

box-sizing: border-box;

}

.cl-btn-5 > span {

background: #BFE2FF;

border: none;

box-shadow: 1px 43px 41px -22px rgba(0, 0, 0, 0.7);

cursor: pointer;

display: block;

transform-style: preserve-3d;

transition: all 250ms ease-in;

transform: rotateX(30deg);

outline: 1px solid transparent;

padding: 18px;

position: relative;

width: 100%;

}

.cl-btn-5 > span:after {

background: #BFE2FF;

content: "";

height: 40%;

left: 0;

position: absolute;

top: 100%;

transform-origin: 0% 0%;

transform: rotateX(-90deg);

transition: all 250ms ease-in;

width: 100%;

z-index: -1;

}

.cl-btn-5 > span > span {

display: block;

height: 40px;

position: relative;

transform: scale(0.9);

width: 40px;

}

.cl-btn-5 > span > span:before,

.cl-btn-5 > span > span:after {

content: "";

border-radius: 2px;

display: block;

width: 85%;

height: 25%;

position: absolute;

top: 37%;

left: 8%;

transition: 0.3s;

background: #337AB7;

transform: rotate(-45deg);

}

.cl-btn-5 > span > span:after {

transform: rotate(45deg);

}

.cl-btn-5 > span:hover,

.cl-btn-5 > span:focus {

background: #BFE2FF;

box-shadow: 1px 43px 41px -22px black;

color: #ED8728;

transform: rotateX(10deg);

}

.cl-btn-5 > span:hover:after,

.cl-btn-5 > span:focus:after {

background: #BFE2FF;

}

.cl-btn-5 > span:hover > span:before,

.cl-btn-5 > span:hover > span:after,

.cl-btn-5 > span:focus > span:before,

.cl-btn-5 > span:focus > span:after {

width: 62%;

}

.cl-btn-5 > span:hover > span:before,

.cl-btn-5 > span:focus > span:before {

transform: rotate(180deg) translate(0, 0);

}

.cl-btn-5 > span:hover > span:after,

.cl-btn-5 > span:focus > span:after {

transform: rotate(-180deg) translate(-37.5%, 0);

}

.cl-btn-5 > span:active {

transform: rotateX(20deg);

}

.cl-btn-5 > span:active > span:before,

.cl-btn-5 > span:active > span:after {

background: skyblue;

}

.cl-btn-5.active > span > span:before,

.cl-btn-5.active > span > span:after {

width: 62%;

}

.cl-btn-5.active > span > span:before {

transform: rotate(180deg) translate(0, 0);

}

.cl-btn-5.active > span > span:after {

transform: rotate(-180deg) translate(-37.5%, 0);

}

Вариант 6:

Еще один вариант кнопки с подписью "закрыть" при наведении.

Закрыть

<div class="cl-btn-6">
	<div class="cl-btn-6-in">
		<div class="cl-btn-6-txt">Закрыть</div>
	</div>
</div>

<div class="cl-btn-6-txt">Закрыть</div>

</div>

.cl-btn-6 {
	position: relative;
	margin: 20px auto;
	width: 70px;
	cursor: pointer;
}
.cl-btn-6-in {
	width: inherit;
	text-align: center;
}
.cl-btn-6-txt { 
	font-size: 13px; 
	line-height: 40px;
	font-weight: bold;
	text-transform: uppercase;
	color: #337AB7;
	transition: all .3s ease-in;
	opacity: 0;
	cursor: pointer;
	font-family: Verdana;
}
.cl-btn-6-in:before, .cl-btn-6-in:after {
	position: absolute;
	content: '';
	height: 4px;
	width: inherit;
	background: #337AB7;
	left: 0;
	transition: all .3s ease-in;
}
.cl-btn-6-in:before {
	top: calc(50% - 4px); 
	transform: rotate(45deg);  
}
.cl-btn-6-in:after {  
	bottom: 50%;
	transform: rotate(-45deg);  
}
.cl-btn-6:hover .cl-btn-6-txt {
	opacity: 1;
}
.cl-btn-6:hover .cl-btn-6-in:before,
.cl-btn-6:hover .cl-btn-6-in:after {
	transform: rotate(0);
}
.cl-btn-6:hover .cl-btn-6-in:before {
	top: 0;
}
.cl-btn-6:hover .cl-btn-6-in:after {
	bottom: 0;
}

.cl-btn-6 {

position: relative;

margin: 20px auto;

width: 70px;

cursor: pointer;

}

.cl-btn-6-in {

width: inherit;

text-align: center;

}

.cl-btn-6-txt {

font-size: 13px;

line-height: 40px;

font-weight: bold;

text-transform: uppercase;

color: #337AB7;

transition: all .3s ease-in;

opacity: 0;

cursor: pointer;

font-family: Verdana;

}

.cl-btn-6-in:before, .cl-btn-6-in:after {

position: absolute;

content: '';

height: 4px;

width: inherit;

background: #337AB7;

left: 0;

transition: all .3s ease-in;

}

.cl-btn-6-in:before {

top: calc(50% - 4px);

transform: rotate(45deg);

}

.cl-btn-6-in:after {

bottom: 50%;

transform: rotate(-45deg);

}

.cl-btn-6:hover .cl-btn-6-txt {

opacity: 1;

}

.cl-btn-6:hover .cl-btn-6-in:before,

.cl-btn-6:hover .cl-btn-6-in:after {

transform: rotate(0);

}

.cl-btn-6:hover .cl-btn-6-in:before {

top: 0;

}

.cl-btn-6:hover .cl-btn-6-in:after {

bottom: 0;

}

Вариант 7:

Простенькая маленькая кнопка

<div class="cl-btn-7"></div>

1	<div class="cl-btn-7"></div>

.cl-btn-7 {
	width: 40px;
	height: 40px;
	border-radius: 40px;
	position: relative;
	z-index: 1;
	margin: 20px auto;
	cursor: pointer;
}
.cl-btn-7:before {
	content: '+';
	color: #337AB7;
	position: absolute;
	z-index: 2;
	transform: rotate(45deg);
	font-size: 50px;
	line-height: 1;
	top: -5px;
	left: 6px;
	transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);
}
.cl-btn-7:after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	border-radius: 100%;
	background: #337AB7;
	z-index: 1;
	transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);
	transform: scale(0.01);
}
.cl-btn-7:hover:after {
	transform: scale(1);
}
.cl-btn-7:hover:before {
	transform: scale(0.8) rotate(45deg);
	color: #fff;
}

.cl-btn-7 {

width: 40px;

height: 40px;

border-radius: 40px;

position: relative;

z-index: 1;

margin: 20px auto;

cursor: pointer;

}

.cl-btn-7:before {

content: '+';

color: #337AB7;

position: absolute;

z-index: 2;

transform: rotate(45deg);

font-size: 50px;

line-height: 1;

top: -5px;

left: 6px;

transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);

}

.cl-btn-7:after {

content: '';

position: absolute;

top: 0;

left: 0;

width: 100%;

height: 100%;

border-radius: 100%;

background: #337AB7;

z-index: 1;

transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);

transform: scale(0.01);

}

.cl-btn-7:hover:after {

transform: scale(1);

}

.cl-btn-7:hover:before {

transform: scale(0.8) rotate(45deg);

color: #fff;

}

Вариант 8:

Кнопка открыть/закрыть с использованием библиотеки jQuery

<div class="cl-btn-8">
	<div class="dot"></div>
</div>

</div>

.cl-btn-8 {
	position: relative;
	width: 45px;
	height: 45px;
	cursor: pointer;
	margin: 30px auto 20px auto;
}
.cl-btn-8 .dot {
	position: absolute;
	bottom: 0;
	left: 50%;
	transform: translateX(-50%);
	width: 9px;
	height: 9px;
	background: #337AB7;
	border-radius: 50%;
	transition: all 0.35s ease;
	backface-visibility: hidden;
}
.cl-btn-8.hover .dot {
	background: transparent;
}
.cl-btn-8 .dot::before, 
.cl-btn-8 .dot::after {
	display: block;
	content: '';
	position: absolute;
	bottom: 0;
	background: #337AB7;
	width: 9px;
	height: 9px;
	border-radius: 50%;
	transition: all 0.35s ease;
}
.cl-btn-8.hover .dot::before, .cl-btn-8.hover .dot::after {
	height: 45px;
	border-radius: 0;
}
.cl-btn-8 .dot::before {
	left: -18px;
}
.cl-btn-8.hover .dot::before {
	transform: rotate(45deg);
	transform-origin: right bottom;
	border-radius: 9px;
}
.cl-btn-8 .dot::after {
	right: -18px;
}
.cl-btn-8.hover .dot::after {
	transform: rotate(-45deg);
	transform-origin: left bottom;
	border-radius: 9px;
}

.cl-btn-8 {

position: relative;

width: 45px;

height: 45px;

cursor: pointer;

margin: 30px auto 20px auto;

}

.cl-btn-8 .dot {

position: absolute;

bottom: 0;

left: 50%;

transform: translateX(-50%);

width: 9px;

height: 9px;

background: #337AB7;

border-radius: 50%;

transition: all 0.35s ease;

backface-visibility: hidden;

}

.cl-btn-8.hover .dot {

background: transparent;

}

.cl-btn-8 .dot::before,

.cl-btn-8 .dot::after {

display: block;

content: '';

position: absolute;

bottom: 0;

background: #337AB7;

width: 9px;

height: 9px;

border-radius: 50%;

transition: all 0.35s ease;

}

.cl-btn-8.hover .dot::before, .cl-btn-8.hover .dot::after {

height: 45px;

border-radius: 0;

}

.cl-btn-8 .dot::before {

left: -18px;

}

.cl-btn-8.hover .dot::before {

transform: rotate(45deg);

transform-origin: right bottom;

border-radius: 9px;

}

.cl-btn-8 .dot::after {

right: -18px;

}

.cl-btn-8.hover .dot::after {

transform: rotate(-45deg);

transform-origin: left bottom;

border-radius: 9px;

}

$('.cl-btn-8').click('on', function() {
	$(this).toggleClass('hover');
});

$('.cl-btn-8').click('on', function() {

$(this).toggleClass('hover');

});

Вариант 9:

Еще одна кнопка открыть/закрыть с использованием библиотеки jQuery

Открыть

<div class="cl-btn-9">
	<div class="cl-btn-9-txt">Открыть</div>
</div>

<div class="cl-btn-9-txt">Открыть</div>

</div>

.cl-btn-9 {
	position: relative;
	margin: 50px auto;
	width: 100px;
	height: 100px;
	background:#337AB7;
	border-radius:50%;
	cursor:pointer;
}
.cl-btn-9:before {
	position:absolute;
	content:"";
	width:30px;
	height:4px;
	left: 24px;
	top: 64px;
	background:#BFE2FF;
	transform:rotate(45deg);
	transition:0.2s;
}
.cl-btn-9:after {
	position:absolute;
	content:"";
	width:30px;
	height:4px;
	right:25px;
	top:64px;
	background:#BFE2FF;
	transform:rotate(-45deg);
	transition:0.2s;
}
.cl-btn-9-txt {
	position:relative;
	text-align:center;
	padding-top:25px;
	color:#fff;
	font-family:Roboto;
}
.cl-btn-9-up:before {
	position:absolute;
	content:"";
	width:35px;
	height:4px;
	left:32px;
	top:66px;
	background:#fff;
	transform:rotate(45deg);
	transition:0.2s;
}
.cl-btn-9-up:after {
	position:absolute;
	content:"";
	width:35px;
	height:4px;
	right:33px;
	top:66px;
	background:#fff;
	transform:rotate(-45deg);
	transition:0.2s;
}

.cl-btn-9 {

position: relative;

margin: 50px auto;

width: 100px;

height: 100px;

background:#337AB7;

border-radius:50%;

cursor:pointer;

}

.cl-btn-9:before {

position:absolute;

content:"";

width:30px;

height:4px;

left: 24px;

top: 64px;

background:#BFE2FF;

transform:rotate(45deg);

transition:0.2s;

}

.cl-btn-9:after {

position:absolute;

content:"";

width:30px;

height:4px;

right:25px;

top:64px;

background:#BFE2FF;

transform:rotate(-45deg);

transition:0.2s;

}

.cl-btn-9-txt {

position:relative;

text-align:center;

padding-top:25px;

color:#fff;

font-family:Roboto;

}

.cl-btn-9-up:before {

position:absolute;

content:"";

width:35px;

height:4px;

left:32px;

top:66px;

background:#fff;

transform:rotate(45deg);

transition:0.2s;

}

.cl-btn-9-up:after {

position:absolute;

content:"";

width:35px;

height:4px;

right:33px;

top:66px;

background:#fff;

transform:rotate(-45deg);

transition:0.2s;

}

$(".cl-btn-9").click(function(){
	var currenttext = $(".cl-btn-9-txt").html();
	if(currenttext == "Открыть"){$(".cl-btn-9-txt").html("Закрыть");}else{$(".cl-btn-9-txt").html("Открыть");}
	$(this).toggleClass("cl-btn-9-up");
});

$(".cl-btn-9").click(function(){

var currenttext = $(".cl-btn-9-txt").html();

if(currenttext == "Открыть"){$(".cl-btn-9-txt").html("Закрыть");}else{$(".cl-btn-9-txt").html("Открыть");}

$(this).toggleClass("cl-btn-9-up");

});

Вариант 1:

Вариант 2:

Вариант 3:

Вариант 4:

Вариант 5:

Вариант 6:

Вариант 7:

Вариант 8:

Вариант 9:

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