Pure CSS switch

index.html

<div class="switch-wrapper">
  <input type="checkbox" class="checkbox" id="checkbox"/>
  <label for="checkbox" class="switch" data-off="off" data-on="on"/>
</div>

style.scss

.switch-wrapper {
  position: relative;
  
  .checkbox {
    display: none;
  }

  .checkbox:checked + .switch {
    background: lighten(#369, 20%);
    
    &:after {
      transform: translateX(40px);
    }
    
    &:before {
      content: attr(data-on);
    }
  }

  .switch {
    display: block;
    width: 70px;
    height: 30px;
    background: #ccc;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: inset 0 2px 3px 0 rgba(#000, .2);

    &:before {
      text-transform: uppercase;
      content: attr(data-off);
      position: absolute;
      left: 75px;
      top: 9px;
    }
		
    &:after {
      display: block;
      content: "";
      width: 30px;
      height: 30px;
      border-radius: 50%;
      background: #fff;
      transition: transform .1s ease-in-out;
    }
  }
}