.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid blue;
    border-bottom: 16px solid blue;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 800ms linear infinite;
    margin: auto auto;
    vertical-align: middle;
    position: relative;
    top: calc(50% - 60px);
  }
  
  @keyframes spin {
    0% { transform: rotate(360deg); }
    100% { transform: rotate(0deg); }
  }