.shimmer:before {
    content: '';
    display: table;
    background-repeat: nrepeat-x;
    background-size: 240px 200px;
    background-image: linear-gradient(90deg, #f6f7f8 0px, #edeef1 40px, #f6f7f8 80px);
    animation: shimmer 1s linear infinite;
  }
  
  @keyframes shimmer {
    0% { background-position: -100% 0; }
    100% { background-position: 100% 0; }
  }