.blink { height: 17px;
  border: 1px solid #B5BCC7;
  padding:0 2px;
  background-color: #FFF;
    animation: blink 1s steps(1, start) infinite; }

@keyframes blink { 0%   { background-color: white;} 
        50%  { background-color: red;}
           100% { background-color: white;}}