.jindu{
    position: absolute;
    left: 0;
    top: 0;
    height: 4px;
    background: #e62129;
    width: 100%;
    animation: jindutiao 3s linear ;
}
@-webkit-keyframes jindutiao {
   0% {
     width: 9.6rem;
 
  }
   100% {
     width: 100%;
 
  }
  }