Five Star Rating System with Pure CSS and Radio Button Hack

A CSS only solution to generate a five star rating system using plain html and radio button hack.

How to use it:

Create five radio buttons for the rating system.

<span class="rating">
  <input id="rating5" type="radio" name="rating" value="5">
  <label for="rating5">5</label>
  <input id="rating4" type="radio" name="rating" value="4">
  <label for="rating4">4</label>
  <input id="rating3" type="radio" name="rating" value="3">
  <label for="rating3">3</label>
  <input id="rating2" type="radio" name="rating" value="2" checked>
  <label for="rating2">2</label>
  <input id="rating1" type="radio" name="rating" value="1">
  <label for="rating1">1</label>
</span>

The core CSS rules for the rating system.

.rating {
  overflow: hidden;
  vertical-align: bottom;
  display: inline-block;
  width: auto;
  height: 30px;
}
.rating > input {
  opacity: 0;
  margin-right: -100%;
}
.rating > label {
  position: relative;
  display: block;
  float: right;
  background: url('star-off-big.png');
  background-size: 30px 30px;
}
.rating > label:before {
  display: block;
  opacity: 0;
  content: '';
  width: 30px;
  height: 30px;
  background: url('star-on-big.png');
  background-size: 30px 30px;
  transition: opacity 0.2s linear;
}
.rating > label:hover:before,  .rating > label:hover ~ label:before,  .rating:not(:hover) > :checked ~ label:before { opacity: 1; }