slider.css

@import url(https://fonts.googleapis.com/css?family='IBM Plex Sans':400,500);
@import url(https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css);
*, *:before, *:after {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}
@font-face {
  font-family: "BerlinTypeWeb-Regular";
  src: url("assets/fonts/WEB/BerlinTypeWeb-Regular.woff") format("woff");
}
@font-face {
  font-family: "BerlinTypeWeb-Bold";
  src: url("assets/fonts/WEB/BerlinTypeWeb-Bold.woff") format("woff");
}

body {
  color: #444;
  font-family: 'BerlinTypeWeb-Regular', sans-serif;
  font-size: 1rem;
  line-height: 1.5;
}

.slider {
  height: 100%;
  position: relative;
  overflow: hidden;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: row nowrap;
      -ms-flex-flow: row nowrap;
          flex-flow: row nowrap;
  -webkit-box-align: end;
  -webkit-align-items: flex-end;
      -ms-flex-align: end;
          align-items: flex-end;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.slider__nav {
  width: 12px;
  height: 12px;
  margin: 2rem 12px;
  border-radius: 50%;
  z-index: 10;
  outline: 6px solid #ccc;
  outline-offset: -6px;
  box-shadow: 0 0 0 0 #333, 0 0 0 0 rgba(51, 51, 51, 0);
  cursor: pointer;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
}
.slider__nav:checked {
  -webkit-animation: check 0.4s linear forwards;
          animation: check 0.4s linear forwards;
}
.slider__nav:checked:nth-of-type(1) ~ .slider__inner {
  left: 0%;
}
.slider__nav:checked:nth-of-type(2) ~ .slider__inner {
  left: -100%;
}
.slider__nav:checked:nth-of-type(3) ~ .slider__inner {
  left: -200%;
}
.slider__nav:checked:nth-of-type(4) ~ .slider__inner {
  left: -300%;
}
.slider__inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 400%;
  height: 100%;
  -webkit-transition: left 0.4s;
  transition: left 0.4s;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-flow: row nowrap;
      -ms-flex-flow: row nowrap;
          flex-flow: row nowrap;
}
.slider__contents {
  height: 100%;
  padding: 2rem;
  text-align: center;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -webkit-flex: 1;
      -ms-flex: 1;
          flex: 1;
  -webkit-flex-flow: column nowrap;
      -ms-flex-flow: column nowrap;
          flex-flow: column nowrap;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.slider__image {
  font-size: 2.7rem;
      color: #e40622;
}
.slider__caption {
  font-weight: 500;
  margin: 2rem 0 1rem;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
  text-transform: uppercase;
}
.slider__txt {
  color: #999;
  margin-bottom: 3rem;
  max-width: 300px;
}

@-webkit-keyframes check {
  50% {
    outline-color: #333;
    box-shadow: 0 0 0 12px #333, 0 0 0 36px rgba(51, 51, 51, 0.2);
  }
  100% {
    outline-color: #333;
    box-shadow: 0 0 0 0 #333, 0 0 0 0 rgba(51, 51, 51, 0);
  }
}

@keyframes check {
  50% {
    outline-color: #333;
    box-shadow: 0 0 0 12px #333, 0 0 0 36px rgba(51, 51, 51, 0.2);
  }
  100% {
    outline-color: #333;
    box-shadow: 0 0 0 0 #333, 0 0 0 0 rgba(51, 51, 51, 0);
  }
} 

/*
@import url(https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css)

@keyframes tonext {
  75% {
    left: 0;
  }
  95% {
    left: 100%;
  }
  98% {
    left: 100%;
  }
  99% {
    left: 0;
  }
}

@keyframes tostart {
  75% {
    left: 0;
  }
  95% {
    left: -300%;
  }
  98% {
    left: -300%;
  }
  99% {
    left: 0;
  }
}

@keyframes snap {
  96% {
    scroll-snap-align: center;
  }
  97% {
    scroll-snap-align: none;
  }
  99% {
    scroll-snap-align: none;
  }
  100% {
    scroll-snap-align: center;
  }
}

body {
  max-width: 37.5rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  font-family: 'Lato', sans-serif;
}

* {
  box-sizing: border-box;
  scrollbar-color: transparent transparent; /* thumb and track color */ /*
  scrollbar-width: 0px;
}

*::-webkit-scrollbar {
  width: 0;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: transparent;
  border: none;
}

* {
  -ms-overflow-style: none;
}

ol, li {
  list-style: none;
  margin: 0;
  padding: 0;
}

.carousel {
  position: relative;
  padding-top: 75%;
  filter: drop-shadow(0 0 10px #0003);
  perspective: 100px;
}

.carousel__viewport {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  overflow-x: scroll;
  counter-reset: item;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
}

.carousel__slide {
  position: relative;
  flex: 0 0 100%;
  width: 100%;
  background-color: #f99;
  counter-increment: item;
}

.carousel__slide:nth-child(even) {
  background-color: #99f;
}

.carousel__slide:before {
  content: counter(item);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%,-40%,70px);
  color: #fff;
  font-size: 2em;
}

.carousel__snapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  scroll-snap-align: center;
}

@media (hover: hover) {
  .carousel__snapper {
    animation-name: tonext, snap;
    animation-timing-function: ease;
    animation-duration: 4s;
    animation-iteration-count: infinite;
  }

  .carousel__slide:last-child .carousel__snapper {
    animation-name: tostart, snap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .carousel__snapper {
    animation-name: none;
  }
}

.carousel:hover .carousel__snapper,
.carousel:focus-within .carousel__snapper {
  animation-name: none;
}

.carousel__navigation {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  text-align: center;
}

.carousel__navigation-list,
.carousel__navigation-item {
  display: inline-block;
}

.carousel__navigation-button {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  background-color: #333;
  background-clip: content-box;
  border: 0.25rem solid transparent;
  border-radius: 50%;
  font-size: 0;
  transition: transform 0.1s;
}

.carousel::before,
.carousel::after,
.carousel__prev,
.carousel__next {
  position: absolute;
  top: 0;
  margin-top: 37.5%;
  width: 4rem;
  height: 4rem;
  transform: translateY(-50%);
  border-radius: 50%;
  font-size: 0;
  outline: 0;
}

.carousel::before,
.carousel__prev {
  left: -1rem;
}

.carousel::after,
.carousel__next {
  right: -1rem;
}

.carousel::before,
.carousel::after {
  content: '';
  z-index: 1;
  background-color: #333;
  background-size: 1.5rem 1.5rem;
  background-repeat: no-repeat;
  background-position: center center;
  color: #fff;
  font-size: 2.5rem;
  line-height: 4rem;
  text-align: center;
  pointer-events: none;
}

.carousel::before {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='0,50 80,100 80,0' fill='%23fff'/%3E%3C/svg%3E");
}

.carousel::after {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolygon points='100,50 20,100 20,0' fill='%23fff'/%3E%3C/svg%3E");
}
*/