Untitled

dabblet.css

.loading {
	border-bottom: 6px solid rgba(0, 0, 0, .1);
	border-left: 6px solid rgba(0, 0, 0, .1);
	border-right: 6px solid rgba(0, 0, 0, .1);
	border-top: 6px solid rgba(0, 0, 0, .4);
	border-radius: 100%;
	height: 50px;
	width: 50px;
	animation: rot .6s infinite linear;
}
@keyframes rot {
	from {transform: rotate(0deg);}
	to {transform: rotate(359deg);}
}

dabblet.html

<div class="loading"></div>

dabblet.js

// alert('Hello world!');

settings.json

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