CSS3で波紋が広がるアニメーションの丸ボタンを作ります。地図及び案内図上で施設や設備を紹介したい時に役立ちます。

デモページ

HTML

<div id="bg">
	<div class="btn">
		<a href="javascript:void(0);">
			<span class="mainLight"></span>
			<span class="ripple"></span>
		</a>
	</div>
	<div class="btn">
		<a href="javascript:void(0);">
			<span class="mainLight"></span>
			<span class="ripple"></span>
		</a>
	</div>
	<div class="btn">
		<a href="javascript:void(0);">
			<span class="mainLight"></span>
			<span class="ripple"></span>
		</a>
	</div>
	<div class="btn">
		<a href="javascript:void(0);">
			<span class="mainLight"></span>
			<span class="ripple"></span>
		</a>
	</div>
	<div class="btn">
		<a href="javascript:void(0);">
			<span class="mainLight"></span>
			<span class="ripple"></span>
		</a>
	</div>
</div>

CSS

#bg {
	width: 100%;
	background-color: #000000;
	padding: 200px 0;
	text-align: center;
}
.btn {
	display: inline-block;
	position: relative;
	z-index: 0;
	width: 20px;
	height: 20px;
	margin: 0 20px;
}
.mainLight {
	display: block;
	position: absolute;
	top: 0;
	z-index: 2;
	width: 20px;
	height: 20px;
	background-color: #ffffff;
	border-radius: 50%;
	transition: .2s linear;
	-webkit-transition: .2s linear;
	-moz-transition: .2s linear;
	-o-transition: .2s linear;
	box-shadow: 0 0 5px rgba(255,255,255,1);
}
a:hover .mainLight {
	background-color: #52d3ff;
	box-shadow: 0 0 10px rgba(82,211,255,1);
}
.ripple {
	display: block;
	position: absolute;
	top: 0;
	z-index: 1;
	width: 20px;
	height: 20px;
	background-color: #52d3ff;
	border-radius: 50%;
	box-shadow: 0 0 5px rgba(82,211,255,1);
	animation-name: rippleAnimation;
	animation-timing-function: ease-out;
	animation-iteration-count: infinite;
	animation-duration: 2s;
	-webkit-animation-name: rippleAnimation;
	-webkit-animation-timing-function: ease-out;
	-webkit-animation-iteration-count: infinite;
	-webkit-animation-duration: 2s;
	-moz-animation-name: rippleAnimation;
	-moz-animation-timing-function: ease-out;
	-moz-animation-iteration-count: infinite;
	-moz-animation-duration: 2s;
}
@keyframes rippleAnimation {
	0% {
		transform: scale(1, 1);
		opacity: 1;
	}
	100% {
		transform: scale(2.5, 2.5);
		opacity: 0;
	}
}
@-webkit-keyframes rippleAnimation {
	0% {
		-webkit-transform: scale(1, 1);
		opacity: 1;
	}
	100% {
		-webkit-transform: scale(2.5, 2.5);
		opacity: 0;
	}
}
@-moz-keyframes rippleAnimation {
	0% {
		-moz-transform: scale(1, 1);
		opacity: 1;
	}
	100% {
		-moz-transform: scale(2.5, 2.5);
		opacity: 0;
	}
}

デモページ