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CSS

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HTML 

              
                <div class="slider-container"  aria-labelledby="carouselheading">
  <!-- stop the slider animation -->
  <input  id="slider-paused" name="to-img" type="radio" value="Animation anhalten" class="visuallyhidden">
  <label for="slider-paused">Animation anhalten</label>
  <input  id="slider-running" name="to-img" type="radio" value="Animation fortsetzen" class="visuallyhidden">
  <label for="slider-running">Animation fortsetzen</label>

  <!-- chose a certain image AND stop the slider animation -->
  <input  id="to-img001" name="to-img" type="radio" value="1. Bild" class="visuallyhidden">
  <label for="to-img001">Zum ersten Bild</label>
  <input  id="to-img002" name="to-img" type="radio" value="2. Bild" class="visuallyhidden">
  <label for="to-img002">Zum zweiten Bild</label>
  <input  id="to-img003" name="to-img" type="radio" value="3. Bild" class="visuallyhidden">
  <label for="to-img003">Zum dritten Bild</label>
  <input  id="to-img004" name="to-img" type="radio" value="4. Bild" class="visuallyhidden">
  <label for="to-img004">Zum vierten Bild</label>

  <!-- restart animation slider animation -->
  <input type="radio" name="to-img" id="start-again" value="Slider neu starten" class="visuallyhidden" checked="checked">
  <label for="start-again">Slider neu starten</label>

  <!-- As an Alternative: remove all the inputs above and give the option to pause/run the animation with the following code -->
  <!-- <input type="checkbox" name="toggle-pause" id="toggle-pause" class="toggle-pause visuallyhidden">
  <label for="toggle-pause" class="toggleAnimationBtn">Animation starten/stoppen</label> -->
  <h1 id="carouselheading">Dia-Show</h1> <!-- informiert z.B. Blinde über das, was folgt, kann per CSS ggfs. vor Sehenden versteckt werden. Beschreibt den Container, der den Slider enthält. Die Zuordnung findet mittels aria-labelledby und id statt -->
  <ul tabindex="0" class="slider">
    <li id="meaningOf1stChild">
      <a href="#">Link eins mit etwas Lorem ipsum um mehrere Zeilen zu erzwingen</a>
      <a class="cta">weiter zu Link 1</a>
    </li>
    <li id="meaningOf2ndChild">
      <a href="#">Link zwei</a>
      <a class="cta">weiter zu Link 2</a>
    </li>
    <li id="meaningOf3rdChild">
      <a href="#">Link drei wieder mit ein wenig mehr Text</a>
      <a class="cta">weiter zu Link 3</a>
    </li>
    <li id="meaningOf4thChild">
      <a href="#">Link vier hat eine individuelle Beschreibung</a>
      <a class="cta">weiter zu Link 4</a>
    </li>
    <!-- beliebig viele ergänzen -->
  </ul>
</div>
<h1>Weitere Inhalte</h1> <!-- informiert z. B. blinde Nutzer, dass ein neuer Inhalt beginnt, die Dia-Show also zu ende ist, s.a. https://www.w3.org/WAI/tutorials/carousels/structure/ -->
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CSS 

              
                /* Slider 
   ============================================================== */

.slider-container {
  text-align: center;
}

/* Slider Controls (start/stop animation and slide choser)  
   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

/* Start/Stop the animation  - - - - - - - - - - - - - - - - - - */

/* starting/stopping the slider */
input#slider-paused:checked ~ .slider li,
ul:focus li,
ul:hover li {
  animation-play-state: paused;
}
input#slider-running:checked ~ .slider li {
  animation-play-state: running;
}
[name="to-img"] + label {
  display: inline-block;
  margin: .5em;
  padding: .5em 1em;
  border: .0625em solid grey;
  border-radius: .5em;
}
[name="to-img"]:focus + label,
[name="to-img"]:hover + label {
  box-shadow: -2px -2px 4px green inset;
}
[name="to-img"] + label::after {
  content: '';
  position: relative;
  left: 0;
  top: .0625rem;
  display: inline-block;
  margin: 0 .5rem;
  border: .0625rem solid black;
  width: 1rem;
  height: 1rem;
  line-height: 1rem;
}
[name="to-img"]:checked + label::after {
  content: 'X';
  font-weight: bold;
  font-size: 2em;
  font-family: sans-serif;
}

/* The  Slider itself   - - - - - - - - - - - - - - - - - - - - - */

.slider {
  list-style-type: none;
  height: 50vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
.slider:focus,
.slider:hover {
  box-shadow: 0 0 0 10px blue;
}
@keyframes slide {
    0%     {top: 0}
    12.5%  {top: 0}
    25%    {top: -100%}
    37.5%  {top: -100%}
    50%    {top: -200%}
    62.5%  {top: -200%}
    75%    {top: -300%}
    87.5%  {top: -300%}
    100%   {top: 0}
}
.slider li {
  position: relative;
  top: 0;
  left: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  align-items: center;
  height: 100%;
  width: 40%;
  min-width: 15em;
  max-width: 30em;
  margin-left: 10vw;
  background: rgba(0, 0, 0, 0.25);
  animation-name: slide;
  animation-duration: 24s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
  animation-play-state: running;
}
input:nth-of-type(3):checked ~ .slider li {
  top: 0;
  animation-name: no-valid-animation;
}
input:nth-of-type(4):checked ~ .slider li {
  top: -100%;
  animation-name: no-valid-animation;
}
input:nth-of-type(5):checked ~ .slider li {
  top: -200%;
  animation-name: no-valid-animation;
}
input:nth-of-type(6):checked ~ .slider li {
  top: -300%;
  animation-name: no-valid-animation;
}
input:nth-of-type(7):checked ~ .slider li {
  top: -400%;
  animation-name: no-valid-animation;
}
input:nth-of-type(8):checked ~ .slider li {
  top: -500%;
  animation-name: no-valid-animation;
}
input:nth-of-type(9):checked ~ .slider li {
  top: -600%;
  animation-name: no-valid-animation;
}
input:nth-of-type(10):checked ~ .slider li {
  top: -700%;
  animation-name: no-valid-animation;
}
input#start-again:last-of-type:checked ~ .slider li {
  top: 0;
  animation-name: slide;
}

.slider li:before {
  content: '';
  display: block;
  position: absolute;
  left: -10vw;
  top: 0;
  background: url('http://www.placehold.it/1400x500?text=Standard-Hintergrund+(Fallback)') no-repeat center;
  background-size: cover;
  width: 100vw;
  height: 50vh;
  z-index: -1;
}
.slider li:nth-child(1):before {
  background-image: url(http://www.placehold.it/1400x500/ffaaaa);
}
.slider li:nth-child(2):before {
  background-image: url(http://www.placehold.it/1400x500/aaffaa);
}
.slider li:nth-child(3):before {
  background-image: url(http://www.placehold.it/1400x500/aaaaff);
}
.slider .cta,
.slider a {
  flex: 1 0 51%;
  margin: 1rem;
  padding: .5rem 1rem;
  background: rgba(0, 0, 0, 0.5);
}
.slider a {
  font-size: 2em;
  text-decoration: none;
  text-shadow: 1px 1px black;
  color: white;
}
.slider .cta {
  color: black;
  border: 1px solid grey;
  background-color: #fff;
}



/* Helper classes 
   ============================================================== */

.visuallyhidden {
		border: 0;
		clip: rect(0 0 0 0);
		height: 1px;
		margin: -1px;
		overflow: hidden;
		padding: 0;
		position: absolute;
		width: 1px;
}
!

JS
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