Octagon

dabblet.css

/**
 * Octagon
 */

.octagon {
	width: 100px;
	height: 100px;
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
	margin: auto;
}
.octagon div {
	position: absolute;
	border-top: #CCC 5px solid;
	border-bottom: #CCC 5px solid;
	width: 45px;
	height: 100px;
}
.octagon div:nth-child(1) {
	transform: rotate(0deg);
	animation: pulse-top 4s ease infinite 0s,
			   pulse-bottom 4s ease infinite 4s;
}
.octagon div:nth-child(2) {
	transform: rotate(45deg);
	animation: pulse-top 4s ease infinite 1s,
			   pulse-bottom 4s ease infinite 5s;
}
.octagon div:nth-child(3) {
	transform: rotate(90deg);
	animation: pulse-top 4s ease infinite 2s,
			   pulse-bottom 4s ease infinite 6s;
}
.octagon div:nth-child(4) {
	transform: rotate(135deg);
	animation: pulse-top 4s ease infinite 3s,
			   pulse-bottom 4s ease infinite 7s;
}

@keyframes pulse-top {
	0% {
		border-top-color: #CCC;
	}
	25% {
		border-top-color: #7fa39f;
	}
	50% {
		border-top-color: #CCC;
	}
}
@keyframes pulse-bottom {
	0% {
		border-bottom-color: #CCC;
	}
	25% {
		border-bottom-color: #7fa39f;
	}
	50% {
		border-bottom-color: #CCC;
	}
}

dabblet.html

<div class="octagon">
	<div></div>
	<div></div>
	<div></div>
	<div></div>
</div>

dabblet.js

// alert('Hello world!');

settings.json

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