HTML
<div class="donutLoader"></div>
CSS
.donutLoader {
border: 10px solid #f3f3f3;
border-top: 10px solid #3498db;
border-radius: 50%;
width: 100px;
height: 100px;
animation: donutspinner 2s linear infinite;
}
@keyframes donutspinner {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}