1  .spinner {
 2      border: 12px solid #f3f3f3;
 3      /* Light grey */
 4      border-top: 12px solid #3498db;
 5      /* Blue */
 6      border-radius: 50%;
 7      width: 16px;
 8      height: 16px;
 9      animation: spin 2s linear infinite;
10  }
11  
12  @keyframes spin {
13      0% {
14          transform: rotate(0deg);
15      }
16  
17      100% {
18          transform: rotate(360deg);
19      }
20  }