@-webkit-keyframes scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(calc(-175px * 19));
    /* Змінили на -175px * 25 */
  }
}

@keyframes scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(calc(-175px * 19));
    /* Змінили на -175px * 25 */
  }
}

.slider {
  height: 70px;
  margin: auto;
  overflow: hidden;
  position: relative;
  opacity: .6;
}

.slider::before,
.slider::after {
  content: "";
  height: 70px;
  position: absolute;
  width: 175px;
  z-index: 2;
}

.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(175px * 25);
}

.slider .slide {
  height: 70px;
  width: 175px;
}