HTML / CSS3 Only Content Slider

A smooth, responsive content slider built on top of HTML radio inputs and CSS3 animations & flexbox model.

How to use it:

Add slider content and radio input controls to your webpage as follows:

<div class="slider">
  <input type="radio" name="slider" title="slide1" checked="checked" class="slider__nav"/>
  <input type="radio" name="slider" title="slide2" class="slider__nav"/>
  <input type="radio" name="slider" title="slide3" class="slider__nav"/>
  <input type="radio" name="slider" title="slide4" class="slider__nav"/>
  <div class="slider__inner">
    <div class="slider__contents">
      <h2 class="slider__caption">Slide 1</h2>
      <p class="slider__txt">Content 1</p>
    </div>
    <div class="slider__contents">
      <h2 class="slider__caption">Slide 2</h2>
      <p class="slider__txt">Content 2</p>
    </div>
    <div class="slider__contents">
      <h2 class="slider__caption">Slide 3</h2>
      <p class="slider__txt">Content 3</p>
    </div>
    <div class="slider__contents">
      <h2 class="slider__caption">Slide 4</h2>
      <p class="slider__txt">Content 4</p>
    </div>
  </div>
</div>

The CSS to style the slider.

.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 0.5s linear forwards;
  animation: check 0.5s linear forwards;
}
.slider__nav:checked:nth-of-type(1) ~ .slider__inner {
  -webkit-transform: translateX(0%);
  transform: translateX(0%);
}
.slider__nav:checked:nth-of-type(2) ~ .slider__inner {
  -webkit-transform: translateX(-25%);
  transform: translateX(-25%);
}
.slider__nav:checked:nth-of-type(3) ~ .slider__inner {
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
}
.slider__nav:checked:nth-of-type(4) ~ .slider__inner {
  -webkit-transform: translateX(-75%);
  transform: translateX(-75%);
}
.slider__inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 400%;
  height: 100%;
  -webkit-transition: all 1s ease-out;
  transition: all 1s ease-out;
  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; }
.slider__caption {
  font-weight: 700;
  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;
}

The CSS3 rules for the check animations.

@-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);
}
}