SOURCE

<div class="loader1"></div>

.loader1{
	position:relative;
	left:50px;
	top:50px;
	width:50px;
	height:50px;
	border:15px solid green;
	border-radius:50%;
	border-top:15px solid yellow;
	animation:spin 2s linear infinite;
}

@keyframes spin{
	0%{
		transform:rotate(0deg)
	}
	100%{
		transform:rotate(360deg)
	}
}