.slider_1{
    position: absolute;
    left: 0px;
    top: 65px;
    height:70%;
    width: 60%;
    margin: auto;
    z-index: -1;
  }

  .slider_1 ul{
      margin: 0;
      list-style: none;
  }

  .slider_1 ul img{
      height: 100%;
      width: 100%;
      margin: 0 auto;
  }

  .slider_1 ul li {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    animation-iteration-count: infinite;
    animation-duration: 21s;
  }

  .slider_1 ul li:nth-child(1){
      animation-name: slider_1;
      animation-delay: -1s;
  }

  .slider_1 ul li:nth-child(2){
      animation-name: slider_1;
      animation-delay: 6s;
      opacity: 0;
  }

  .slider_1 ul li:nth-child(3){
      animation-name: slider_1;
      animation-delay: 13s;
      opacity: 0;
  }

  @keyframes slider_1{
      0%{
          opacity: 0;
      }

      4.76%{
          opacity: 1;
      }

      33.33%{
          opacity: 1;
      }

      42.85%{
          opacity: 0;
      }

      100%{
          opacity: 0;
      }
  }