Dabblet - Hover effect #1

dabblet.css

/**
  * Dabblet - Hover effect #1
  */

* {
	box-sizing: border-box;
}

:root {
	/* background pattern: http://subtlepatterns.com/triangular/ */
	background: #eee url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADwAAAA8AgMAAABHkjHhAAAADFBMVEW3t72zs7q4uL66usDztsWmAAAAgUlEQVR4AV3HoZUCAQxF0TWLob6JSQeY3xclYNIXJpzDMOK96+7fz//xVXrr0Yev5VuPPnwt33r04Wv51qMPX8u3Hn34Wr716MPX8q1HH/62/P36cXo8T9dffL351qMPX8u3Hn34Wr716MPX8q1HH76Wbz368LV869GHr+Vbjz78B9UMtIcMXHm1AAAAAElFTkSuQmCC') top left;
	margin: 2em 0;
	font-family: Futura;
	font-weight: bold;
	text-transform: uppercase;
	font-size: 4em;
}

.circle {
	overflow: hidden;
	display: block;
	position: relative;
	width: 6em;
	height: 6em;
	margin: 0 auto;
	line-height: 6em;
	cursor: pointer;
	text-align: center;
	border-radius: 999em;
	background: #0099cc;
	box-shadow: none;
	color: #fff;
	/*text-shadow: 0 0 2px #056495;*/
	transition: box-shadow .5s linear, transform .5s linear;
}

.circle:hover {
	box-shadow: inset 0 0 0 0.5em #056495,
				inset 0 0 0 .6em #0099cc,
				inset 0 0 0 .63em #056495;
	transform: rotate(360deg);
}

.circle:before,
.circle:after {
	content: '';
	width: 0;
	height: .2em;
	background: #fff;
	position:absolute;
	margin-left: 0;
	left: 50%;
	transition: width .5s linear .6s,
				margin-left .5s linear .6s;
}

.circle:before {
	box-shadow: 0 -.3em 0 -.08em #fff;
	top: 1.8em;  /* 2em - el height */
}
.circle:after {
	top: 4em;
	box-shadow: 0 .3em 0 -.08em #fff;
}	

.circle:hover:before,
.circle:hover:after {
	width: 100%;
	margin-left: -50%;
}

dabblet.html

<a class="circle">Dabblet</a>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}