@-webkit-keyframes scroll {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(calc(-250px * 7));
            transform: translateX(calc(-250px * 7));
  }
}

@keyframes scroll {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(calc(-250px * 7));
            transform: translateX(calc(-250px * 7));
  }
}
.slider {
  background: white;
  height: 100px;
  margin: auto;
  overflow: hidden;
  position: relative;
  width: 1080px;
}


@media all and (max-width: 840px) {
    .slider {
        background: white;
        height: 100px;
        margin: auto;
        overflow: hidden;
        position: relative;
        width: 360px;
    }
}

.slider::before, .slider::after {
  background: -webkit-gradient(linear, left top, right top, from(white), to(rgba(255, 255, 255, 0)));
  background: linear-gradient(to right, white 0%, rgba(255, 255, 255, 0) 100%);
  content: "";
  height: 100px;
  position: absolute;
  width: 200px;
  z-index: 2;
}
.slider::after {
  right: 0;
  top: 0;
  -webkit-transform: rotateZ(180deg);
          transform: rotateZ(180deg);
}
.slider::before {
  left: 0;
  top: 0;
}
.slider .slide-track {
  -webkit-animation: scroll 40s linear infinite;
          animation: scroll 40s linear infinite;
  display: -webkit-box;
  display: flex;
  width: calc(250px * 14);
}
.slider .slide {
  height: 100px;
  width: 250px;
}