@keyframes scroll {
    0% {
              transform: translateX(0);
    }
    100% {
              transform: translateX(calc(-350px * 8));
    }
  }
  .slider {  
    margin: auto;
    overflow: hidden;
    position: relative;
    width: 100%;
  }

  .slider::before, .slider::after {
    --background: linear-gradient(to right, #1b335f 0%, rgba(255, 255, 255, 0) 100%);
    content: "";    
    position: absolute;
    width: 350px;
    z-index: 2;
  }
  .slider::after {
    right: 0;
    top: 0;
    transform: rotateZ(180deg);
  }

  .slider::before {
    left: 0;
    top: 0;
  }
  .slider .slide-track {
    animation: scroll 60s linear infinite;
    display: flex;
    width: calc(350px * 16);
    align-items: center;
    justify-content: center;
  }
  .slider .slide {
    text-align: center;
    width: 350px;
    margin: 0px 60px;
  }