@keyframes scroll {
    0% {
      transform: translateX(0);
    }
    100% {
      transform: translateX(calc(-3147px)); 
    }
  }
  /*-350px * 5 */
  .slider {
    background: white;
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.125);
    height: 70px;
    margin: auto;
    overflow: hidden;
    position: relative;
    width: auto;
  }
  
  .slider::before,
  .slider::after {
    /*background: linear-gradient(to right, white 0%, rgba(255, 255, 255, 0) 100%);*/
    content: "";
    height: 70px;
    position: absolute;
    width: 400px;
    z-index: 2;
  }
  
  .slider::after {
    right: 0;
    top: 0;
    transform: rotateZ(180deg);
  }
  
  .slider::before {
    left: 0;
    top: 0;
  }
  
  .slide-track {
    display: flex;
    width: calc(3147px); /* 5 immagini + 5 duplicate */
    animation: scroll 20s linear infinite;
  }
  
  .slide {
    width: auto;
    height: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
  }