NerdNotes

<div class="loader"></div> 
<style> 
.loader {
  border: 16px solid #f3f3f3; /* Light grey */
  border-top: 16px solid #3498db; /* Blue */
  border-radius: 50%;
  width: 120px;
  height: 120px;
  animation: spin 2s linear infinite;
}
.loader2 {
  border-top: 16px solid blue;
  border-bottom: 16px solid blue;
} 
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
} 
</style>