CodePen Embed - CSS slider

<div class="outer-wrapper">
  <h1>Demo 1</h1>
  <div class="s-wrap s-type-1" role="slider">
    <input type="radio" id="s-1" name="slider-control" checked="checked">
    <input type="radio" id="s-2" name="slider-control">
    <input type="radio" id="s-3" name="slider-control">
    <input type="radio" id="s-4" name="slider-control">
    <input type="radio" id="s-5" name="slider-control">
    <ul class="s-content">
      <li class="s-item s-item-1"></li>
      <li class="s-item s-item-2"></li>
      <li class="s-item s-item-3"></li>
      <li class="s-item s-item-4"></li>
      <li class="s-item s-item-5"></li>
    </ul>
    <div class="s-control">
      <label class="s-c-1" for="s-1"></label>
      <label class="s-c-2" for="s-2"></label>
      <label class="s-c-3" for="s-3"></label>
      <label class="s-c-4" for="s-4"></label>
      <label class="s-c-5" for="s-5"></label>
    </div>
    <div class="s-nav">
      <label class="s-nav-1 right" for="s-2"></label>
      <label class="s-nav-2 left" for="s-1"></label>
      <label class="s-nav-2 right" for="s-3"></label>
      <label class="s-nav-3 left" for="s-2"></label>
      <label class="s-nav-3 right" for="s-4"></label>
      <label class="s-nav-4 left" for="s-3"></label>
      <label class="s-nav-4 right" for="s-5"></label>
      <label class="s-nav-5 left" for="s-4"></label>
    </div>
  </div>

  <h1>Demo 2</h1>
  <p>hover would pause the animation</p>
  <div class="s-wrap s-type-2" role="slider">
    <ul class="s-content">
      <li class="s-item s-item-1"></li>
      <li class="s-item s-item-2"></li>
      <li class="s-item s-item-3"></li>
      <li class="s-item s-item-4"></li>
      <li class="s-item s-item-5"></li>
    </ul>
  </div>
  
  <h1>Demo 3</h1>
  <p>Using JS</p>
  <div class="s-wrap s-type-3">
    <ul class="s-content" data-index="1">
      <li class="s-item s-item-1"></li>
      <li class="s-item s-item-2"></li>
      <li class="s-item s-item-3"></li>
      <li class="s-item s-item-4"></li>
      <li class="s-item s-item-5"></li>
    </ul>
    <div class="left-control"></div>
    <div class="right-control"></div>
  </div>
</div>

$switch-speed: 1s;
$slider-number: 5;
$slider-width: 100% / $slider-number;

$image1: 'https://images.unsplash.com/photo-1457369804613-52c61a468e7d?crop=entropy&fit=crop&fm=jpg&h=600&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=800';
$image2: 'https://images.unsplash.com/photo-1456318019777-ccdc4d5b2396?crop=entropy&fit=crop&fm=jpg&h=600&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=800';
$image3: 'https://images.unsplash.com/photo-1428189923803-e9801d464d76?crop=entropy&fit=crop&fm=jpg&h=600&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=800';
$image4: 'https://images.unsplash.com/photo-1422393462206-207b0fbd8d6b?crop=entropy&fit=crop&fm=jpg&h=600&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=800';
$image5: 'https://images.unsplash.com/photo-1439736637365-748f240b24fb?crop=entropy&fit=crop&fm=jpg&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=800';

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: #1C2325;
  color: #eee;
}

.outer-wrapper {
  width: 80%;
  margin: 50px auto;
}

// basic styles
.s-wrap {
  width: 100%;
  margin-bottom: 50px;
  padding-bottom: 55%;
  position: relative;
  border: 10px solid #fff;
  background-color: #efefe8;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  overflow: hidden;

  > input {
    display: none;
  }

  .s-content {
    margin: 0;
    padding: 0;
    position: absolute;
    top: 0;
    left: 0;
    width: 100% * $slider-number;
    height: 100%;
    font-size: 0;
    list-style: none;
    transition: transform $switch-speed;
  }

  .s-item {
    display: inline-block;
    width: $slider-width;
    height: 100%;
    background-repeat: no-repeat;
    background-size: cover;
  }

  .s-item-1 {background-image: url($image1);}
  .s-item-2 {background-image: url($image2);}
  .s-item-3 {background-image: url($image3);}
  .s-item-4 {background-image: url($image4);}
  .s-item-5 {background-image: url($image5);}
}

.s-type-1 {
  .s-control {
    position: absolute;
    bottom: 18px;
    left: 50%;
    text-align: center;
    transform: translateX(-50%);
    transition-timing-function: ease-out;

    > label[class^="s-c-"] {
      display: inline-block;
      width: 12px;
      height: 12px;
      margin-right: 10px;
      border-radius: 50%;
      border: 1px solid #999;
      background-color: #efefe8;
      cursor: pointer;
    }
  }

  .s-nav label {
    display: none;
    position: absolute;
    top: 50%;
    padding: 5px 10px;
    transform: translateY(-50%);
    cursor: pointer;

    &::before,
    &::after {
      content: "";
      display: block;
      width: 8px;
      height: 24px;
      background-color: #fff;
    }

    &::before {margin-bottom: -12px;}

    &.left {
      left: 20px;

      &::before {transform: rotate(45deg);}

      &::after {transform: rotate(-45deg);}
    }

    &.right {
      right: 20px;

      &::before {transform: rotate(-45deg);}

      &::after {transform: rotate(45deg);}
    }
  }

  @for $i from 1 through $slider-number {
    #s-#{$i}:checked {
      & ~ .s-content {transform: translateX(-$slider-width * ($i - 1));}

      & ~ .s-control .s-c-#{$i} {background-color: #333;}

      & ~ .s-nav .s-nav-#{$i} {display: block;}
    }
  }
}

.s-type-2 {
  .s-content {
    animation: slider-animation 50s ease-in-out infinite;

    &:hover {animation-play-state: paused;}
  }
}

@keyframes slider-animation {
  $i: 0;
  $j: 0;
  $times: ($slider-number - 1) * 2;
  @while $i < 100 {
    #{$i}%,
    #{$i + 7}% {
      @if $i < 50 {
        transform: translateX(-$slider-width * $j);
          } @else {
            transform: translateX(-$slider-width * ($times - $j));
              }
    }

    $i: $i + 100 / $times;
    $j: $j + 1;
  }
}

.s-type-3 {
  .left-control,
  .right-control {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    height: 100%;
    width: 60px;
    background-color: rgba(0,0,0,0.3);
    cursor: pointer;
  }
  
  .right-control {
    left: auto;
    right: 0;
  }
}

View Compiled

/* Responsive CSS slider */

let sliderUL = document.querySelector('.s-type-3 > .s-content');
let sliderLength = sliderUL.childElementCount;
let leftControl = document.querySelector('.s-type-3 .left-control');
let rightControl = document.querySelector('.s-type-3 .right-control');
let getCurrentIndex = () => Number(sliderUL.getAttribute('data-index'));
let setCurrentIndex = index => {
  console.log(index);
  sliderUL.setAttribute('data-index', index);
  sliderUL.style = `transform: translateX(-${(index - 1) * (100 / sliderLength)}%)`
}
let onControlClick = (direction) => {
  let index = getCurrentIndex();
  index = direction === 'left'
    ? (index === 1 ? sliderLength : index - 1)
    : (index === sliderLength ? 1 : index + 1)
  setCurrentIndex(index);
}

leftControl.addEventListener('click', () => onControlClick('left'));

rightControl.addEventListener('click', () => onControlClick('right'));

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