<input type="radio" id="trigger1" name="slider">
<label for="trigger1"><span class="sr-only">Slide 1 of 5. A photo of a mountain pass with a winding path along the river and a view of distant mountains hiding in the mist.</span></label>
<div class="slide bg1"></div>

<input type="radio" id="trigger2" name="slider" checked autofocus>
<label for="trigger2"><span class="sr-only">Slide 2 of 5. A photo of a bird eating sunflower seeds from an open hand.</span></label>
<div class="slide bg2"></div>

<input type="radio" id="trigger3" name="slider">
<label for="trigger3"><span class="sr-only">Slide 3 of 5. A photo of a concrete bridge over the river with high voltage power lines on both banks.</span></label>
<div class="slide bg3"></div>

<input type="radio" id="trigger4" name="slider">
<label for="trigger4"><span class="sr-only">Slide 4 of 5. A photo of a lake surrounded by the forest with mountains in the background.</span></label>
<div class="slide bg4"></div>

<input type="radio" id="trigger5" name="slider">
<label for="trigger5"><span class="sr-only">Slide 5 of 5. A photo of a forest.</span></label>
<div class="slide bg5"></div>
body, html {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  overflow: hidden;
  user-select: none;
}

.sr-only {
  position: absolute;
  pointer-events: none;
  width: 1px;
  height: 1px;
  overflow: hidden;
  color: transparent;
}

input {
  position: absolute;  
  opacity: 0;
  margin-top: 95vh;
  cursor: pointer;
}

label {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: solid 2px white;
  border-radius: 999px;
  background-color: transparent;
  margin: 95vh 6px 0 6px;
  z-index: 2;
  cursor: pointer;
  transition-duration: .4s;
  box-shadow: 0 0 20px 0 #000;
}

input:checked + label{
  background-color: white;
}

input + label::after{
  content: '';
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 512' width='100' style='fill:white'%3E%3Cpath d='M31.7 239l136-136c9.4-9.4 24.6-9.4 33.9 0l22.6 22.6c9.4 9.4 9.4 24.6 0 33.9L127.9 256l96.4 96.4c9.4 9.4 9.4 24.6 0 33.9L201.7 409c-9.4 9.4-24.6 9.4-33.9 0l-136-136c-9.5-9.4-9.5-24.6-.1-34z' /%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center 55%;
  background-size: 80px 80px;
  line-height: 100vh;
  transition: background-size 200ms;
  position: absolute;
  color: white;
  height: calc(95vh - 12px);
  width: 80px;
  top: 0;
  left: 0;
  z-index: 20;
}

input + label:hover::after {
  background-size: 90px 90px;
}

input:checked + label::after {
  background-image: none;
  width: 100vw;
  left: 0;
  z-index: 10;
}

input:checked + label + .slide ~ input + label::after {
  display: none;
}

input:checked + label + .slide + input + label::after {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 512' width='100' fill='white'%3E%3Cpath d='M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z' /%3E%3C/svg%3E");
  display: block;
  width: 80px;
  right: 0;
  left: auto;
}

input:focus + label{
  box-shadow: 0 0 0 2px teal, 0 0 18px white;
}

.slide {
  position: absolute;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: -1;
  transform: translateX(-100%);
  transition-duration: .4s;
  opacity: 1;
}

input:checked ~ .slide {
  transform: translateX(100%);
}

input:checked + label + .slide {
  transform: translateX(0);
  opacity: 1;
}

.bg1{
  background-image: url(https://images.unsplash.com/photo-1422806310414-91469fe4977e?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=114e7a73b2385128045a5555b981e939);
}
.bg2{
  background-image: url(https://images.unsplash.com/photo-1490020641477-3b0e96306b9a?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=d8358f021c68f49335fe44b10f70b700);
}
.bg3{
  background-image: url(https://images.unsplash.com/photo-1512529111457-3e8a595ef8e9?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=9b3ab76b65a358830d60ca43be76f2e1);
}
.bg4{
  background-image: url(https://images.unsplash.com/photo-1504700610630-ac6aba3536d3?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=92d2cae094fb24e5266221828ee251e2);
}
.bg5{
  background-image: url(https://images.unsplash.com/reserve/wPCyys8TPCHY3GXm2N2D_ssp_inthewoods_1.jpg?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=654d988a19f43ca9ac27f2eacbe2a554);
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.