Слайдер на чистом css

Слайдер интересный, работает без возвратов назад. Как на чистом js

by akogch

HTML

<ul class="slides">
  <input type="radio" name="radio-btn" id="img-1" checked />
  <li class="slide-container">
    <div class="slide">
      <img
        src="http://farm9.staticflickr.com/8072/8346734966_f9cd7d0941_z.jpg"
      />
    </div>
    <div class="nav">
      <label for="img-6" class="prev">&#x2039;</label>
      <label for="img-2" class="next">&#x203a;</label>
    </div>
  </li>

  <input type="radio" name="radio-btn" id="img-2" />
  <li class="slide-container">
    <div class="slide">
      <img
        src="http://farm9.staticflickr.com/8504/8365873811_d32571df3d_z.jpg"
      />
    </div>
    <div class="nav">
      <label for="img-1" class="prev">&#x2039;</label>
      <label for="img-3" class="next">&#x203a;</label>
    </div>
  </li>

  <input type="radio" name="radio-btn" id="img-3" />
  <li class="slide-container">
    <div class="slide">
      <img
        src="http://farm9.staticflickr.com/8068/8250438572_d1a5917072_z.jpg"
      />
    </div>
    <div class="nav">
      <label for="img-2" class="prev">&#x2039;</label>
      <label for="img-4" class="next">&#x203a;</label>
    </div>
  </li>

  <input type="radio" name="radio-btn" id="img-4" />
  <li class="slide-container">
    <div class="slide">
      <img
        src="http://farm9.staticflickr.com/8061/8237246833_54d8fa37f0_z.jpg"
      />
    </div>
    <div class="nav">
      <label for="img-3" class="prev">&#x2039;</label>
      <label for="img-5" class="next">&#x203a;</label>
    </div>
  </li>

  <input type="radio" name="radio-btn" id="img-5" />
  <li class="slide-container">
    <div class="slide">
      <img
        src="http://farm9.staticflickr.com/8055/8098750623_66292a35c0_z.jpg"
      />
    </div>
    <div class="nav">
      <label for="img-4" class="prev">&#x2039;</label>
      <label for="img-6" class="next">&#x203a;</label>
    </div>
  </li>

  <input type="radio" name="radio-btn" id="img-6" />
  <li...

CSS

@import url(https://fonts.googleapis.com/css?family=Varela+Round);
html,
body {
  background: #333 url("https://codepen.io/images/classy_fabric.png");
}

.slides {
  padding: 0;
  width: 609px;
  height: 420px;
  display: block;
  margin: 0 auto;
  position: relative;
}

.slides * {
  user-select: none;
  -ms-user-select: none;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.slides input {
  display: none;
}

.slide-container {
  display: block;
}

.slide {
  top: 0;
  opacity: 0;
  width: 609px;
  height: 420px;
  display: block;
  position: absolute;
  transform: scale(0);
  transition: all 0.7s ease-in-out;
}

.slide img {
  width: 100%;
  height: 100%;
}

.nav label {
  width: 200px;
  height: 100%;
  display: none;
  position: absolute;
  opacity: 0;
  z-index: 9;
  cursor: pointer;
  transition: opacity 0.2s;
  color: #fff;
  font-size: 156pt;
  text-align: center;
  line-height: 380px;
  font-family: "Varela Round", sans-serif;
  background-color: rgba(255, 255, 255, 0.3);
  text-shadow: 0px 0px 15px rgb(119, 119, 119);
}

.slide:hover + .nav label {
  opacity: 0.5;
}

.nav label:hover {
  opacity: 1;
}

.nav .next {
  right: 0;
}

input:checked + .slide-container .slide {
  opacity: 1;
  transform: scale(1);
  transition: opacity 1s ease-in-out;
}

input:checked + .slide-container .nav label {
  display: block;
}

.nav-dots {
  width: 100%;
  bottom: 9px;
  height: 11px;
  display: block;
  position: absolute;
  text-align: center;
}

.nav-dots .nav-dot {
  top: -5px;
  width: 11px;
  height: 11px;
  margin: 0 4px;
  position: relative;
  border-radius: 100%;
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.6);
}

.nav-dots .nav-dot:hover {
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.8);
}

input#img-1:checked ~ .nav-dots...