h1 Liquid Button
	span made by YU EN
.wrap
	.span.span-1
	.span.span-2
	.span.span-3
	.span.span-4
	.symbol ⋮
	p Background
.wrap-2
	.span.span-1
	.span.span-2
	.span.span-3
	.span.span-4
	.symbol ⋮
	p Outline
	
View Compiled
body {
	margin: 0;
	padding: 0;
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	align-items: center;
	height: 100vh;
	background: #FFE8D5;
	font-family: 'Catamaran', sans-serif;
	font-family: 'Ubuntu', sans-serif;
	font-family: 'Libre Baskerville', serif;
	letter-spacing: .5px;
}
h1 {
	width: 100%;
	text-align: center;
	font-size: 20px;
	color: #FFAA63;
	margin-top: 1.5rem;
	position: absolute;
	top: 50%;
	span {
		display: block;
		font-size: 12px;
		opacity: .6;
		margin-top: .7rem;
		font-family: 'Catamaran', sans-serif;
	}
}
p {
	width: 100%;
	text-align: center;
	font-size: 16px;
	color: #FF9D4C;
	margin-top: 1.5rem;
	position: absolute;
	top: 90px;
	opacity: .5;
	transition: all 300ms;
	font-family: 'Ubuntu', sans-serif;
	font-weight: 500;
}
$w: 130px;
.wrap, .wrap-2 {
	margin: 0 3rem;
	display: flex;
	justify-content: center;
	align-items: center;
	position: relative;
	width: 35%;
	&:hover {
		p {
			opacity: 1;
		}
	}
	.span {
		cursor: pointer;
		border: 1.5px solid white;
		width: $w;
		height: $w;
		position: absolute;
		opacity: .6;
		border-radius: 100%;
		transition: all;
	}
}
.wrap {
	.symbol {
			color: #FFD3AE;
			font-size: 36px;
			z-index: 1;
			transition: all 1000ms;
			user-select: none;
			cursor: pointer;
			&.go-heart {
				transition: all 1000ms;
				animation: go-heart 1000ms infinite linear;
			}
	}
	.span {
		cursor: pointer;
		border: 1.5px solid white;
		position: absolute;
		background: white;
		opacity: .6;
		border-radius: 100%;
		transition: all;
	}
	.span-1 {
		transition: all 1200ms;
		&.go {
			border-radius: 40% 42% 45% 55%;
			animation: gogo 5200ms infinite linear;
		}
	}
	.span-2 {
		transition: all 1200ms;
		&.go {
			border-radius: 55% 41% 65% 43%;
			animation: gogo-2 5500ms infinite linear;
		}
	}
	.span-3 {
		transition: all 1200ms;
		&.go {
			border-radius: 52% 72% 45% 61%;
			animation: gogo 3400ms infinite linear;
		}
	}
	.span-4 {
		transition: all 1200ms;
		&.go {
			border-radius: 58% 56% 72% 58%;
			animation: gogo-2 6000ms infinite linear;
		}
	}
}
.wrap-2 {
	.symbol {
			color: white;
			font-size: 36px;
			z-index: 1;
			transition: all 1000ms;
			user-select: none;
			cursor: pointer;
			&.go-heart {
				transition: all 1000ms;
				animation: go-heart 1000ms infinite linear;
			}
	}
	.span-1 {
		transition: all 1200ms;
		&.go {
			border-radius: 40% 42% 45% 55%;
			animation: gogo 5200ms infinite linear;
		}
	}
	.span-2 {
		transition: all 1200ms;
		&.go {
			border-radius: 55% 41% 65% 43%;
			animation: gogo-2 5500ms infinite linear;
		}
	}
	.span-3 {
		transition: all 1200ms;
		&.go {
			border-radius: 52% 72% 45% 61%;
			animation: gogo 3400ms infinite linear;
		}
	}
	.span-4 {
		transition: all 1200ms;
		&.go {
			border-radius: 58% 56% 72% 58%;
			animation: gogo-2 6000ms infinite linear;
		}
	}
}
.go {
	transition: all 1200ms;
}
@keyframes gogo {
	from {
		transform: rotate(0deg);
	}
	to {
		transform: rotate(360deg);
	}
}
@keyframes gogo-2 {
	from {
		transform: rotate(0deg);
	}
	to {
		transform: rotate(-720deg);
	}
}
@keyframes go-heart {
	from {
		transform: scale(1.3) rotate(0deg);
	} to {
		transform: scale(1.3) rotate(360deg);
	}
}
View Compiled

$('.wrap').on('click', function(){
	$('.wrap .span-1').toggleClass('go');
	$('.wrap .span-2').toggleClass('go');
	$('.wrap .span-3').toggleClass('go');
	$('.wrap .span-4').toggleClass('go');
	$('.wrap .symbol').toggleClass('go-heart');
})

$('.wrap-2').on('click', function(){
	$('.wrap-2 .span-1').toggleClass('go');
	$('.wrap-2 .span-2').toggleClass('go');
	$('.wrap-2 .span-3').toggleClass('go');
	$('.wrap-2 .span-4').toggleClass('go');
	$('.wrap-2 .symbol').toggleClass('go-heart');
})
Run Pen

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js