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

@keyframes scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(calc(-250px * 7));
  }
}
.slider {
  padding-top: 10px;
  padding-bottom: 10px;
  background: white;
  border: 2px solid #ccc;
  border-radius: 30px;
  height: 120px;
  margin: auto;
  overflow: hidden;
  position: relative;
  width: 100%;
}

.slider::after {
  right: 0;
  top: 0;
  transform: rotateZ(180deg);
}
.slider::before {
  left: 0;
  top: 0;
}
.slider .slide-track {
  -webkit-animation: scroll 40s linear infinite;
          animation: scroll 40s linear infinite;
  display: flex;
  width: calc(250px * 14);
}
.slider .slide {
  height: 100px;
  width: 250px;
}