.shake {
    
      
    position: relative;
    -webkit-animation-name: example; /* Safari 4.0 - 8.0 */
    -webkit-animation-duration: 1s; /* Safari 4.0 - 8.0 */
    -webkit-animation-iteration-count: infinite; /* Safari 4.0 - 8.0 */
    animation-name: example;
    animation-duration: 1s;
    animation-iteration-count: infinite;
  }
  
  /* Safari 4.0 - 8.0 */
  @-webkit-keyframes example {
    0%   { font-weight: 600; font-size: 20px;}
    
    
  }
  
  /* Standard syntax */
  @keyframes example {
    0%   {font-weight: 600;font-size: 20px; }
    
  }