.loader {
    position: absolute;
    z-index: 6;
    top: 0px;
    left: 0;
    height: 4px;
    width: 100%;
    overflow: hidden;
    background-color: #ddd;
  }
  
  .loader:before {
    display: block;
    position: absolute;
    content: "";
    left: -200px;
    width: 200px;
    height: 4px;
    background-color: #ff8373;
    animation: loading 2s linear infinite;
  }
  
  @keyframes loading {
    from {
      left: -200px;
      width: 30%;
    }
  
    50% {
      width: 30%;
    }
  
    70% {
      width: 70%;
    }
  
    80% {
      left: 50%;
    }
  
    95% {
      left: 120%;
    }
  
    to {
      left: 100%;
    }
  }