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.set {
	position:relative;
	font-weight:400;
	text-align:center;
	width:200px;
	height:200px;
	line-height:200px;
	overflow:hidden;
	position:relative;
	z-index:0;
	color:#000000;
	background:#fafafa;
	cursor:pointer;
}
.anim {
	-moz-transform:translateY(-50%) translateX(-50%);
	-ms-transform:translateY(-50%) translateX(-50%);
	-webkit-transform:translateY(-50%) translateX(-50%);
	transform:translateY(-50%) translateX(-50%);
	position:absolute;
	top:50%;
	left:50%;
	z-index:-1;
}
.anim:before {
	position:relative;
	content:'';
	display:block;
	margin-top:100%;
	background:#6CB1FF;
}
.anim:after {
	content:'';
	position:absolute;
	top:0;
	bottom:0;
	left:0;
	right:0;
	border-radius:50%;
}
.hoverable:hover>.anim:after {
	-webkit-animation:anim-out-pseudo 0.75s;
	animation:anim-out-pseudo 0.75s;
}
.set:hover>.anim {
	-webkit-animation:anim-out 0.75s;
	animation:anim-out 0.75s;
}
@-webkit-keyframes anim-out-pseudo {
	0% {
	background:rgba(255,203,0,50);
}
100% {
	background:transparent;
}
}@-webkit-keyframes anim-out {
	0% {
	width:0%;
}
100% {
	width:100%;
}
}

                        
↑上面代码改变,会自动显示代码结果 jQuery调用版本:1.11.3
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鼠标悬浮出现水波纹

鼠标悬浮会有水波纹扩散,圆形背景可以修改border-radius: 20px;

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