<div>
<label>
  <input type="checkbox" checked/>
  <div>
    <span class="on">On</span>
    <span class="off">Off</span>
  </div>  
  <i></i>
</label>
</div>
*, *:before, *:after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
}

body {
  font-family: "Open Sans", sans-serif;
  font-size: 1em;
  line-height: 1.6;
  background: #dbdbdb;
  &>div {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    
  }
}

label {
  // Just to make it bigger in the pen preview, 
  // it uses pixels, so it's not responsive
  transform: scale(1.5); 
  // end 
  display: block;
  width: 160px;
  background: #CCC;
  height: 80px;
  border-radius: 40px;
  background: linear-gradient(to bottom, #9e9e9e 30%, #f4f4f4);
  box-shadow: 0 2px 0 0 #fff, 0 -2px 0 0 #969494;
  position: relative;
  // Remove mobile tab color
  -webkit-tap-highlight-color:  rgba(255, 255, 255, 0); 
  input {
    display: none;
  }
  
  div {
    display: block;
    width: 120px;
    height: 50px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(to bottom, #8b8c8e 20%, #f4f4f4);
    border-radius: 25px;
    &:after {
      content: "";
      position: absolute;
      display: block;
      height: 46px;
      width: 116px;
      left: 2px;
      top: 2px;
      border-radius: 23px;
      background: #828080;
      box-shadow: inset 0 0 30px 0 rgba(0,0,0,0.8);
      transition: .20s;
    }
  }
  
  i {
    display: block;
    width: 60px;
    height: 60px;
    position: absolute;
    background: linear-gradient(to top, #9e9e9e 20%, #f4f4f4);
    border-radius: 50%;
    box-shadow: 0 5px 10px 0 rgba(0,0,0,0.7);
    top: 10px;
    left: 15px;
    transition: .25s;
    &:after {
      content: "";
      position: absolute;
      display: block;
      width: 52px;
      height: 52px;
      left: 4px;
      top: 4px;
      border-radius: 50%;
      background: #d5d4d4;
      z-index: 1;
    }
  }
  
  input:checked ~ i {
    top: 10px;
    left: 86px;
  }
  
  input:checked + div:after {
    background: #f7931e;
    box-shadow: inset 0 0 30px 0 rgba(0,0,0,0.6);
  }
  
  input:checked + div > .off {
    color: transparent;
    text-shadow: 0 1px 0 rgba(255,255,255,0);
  }
  
  input:checked + div > .on{
    color: #c6631d;
    text-shadow: 0 1px 0 rgba(255,255,255, 0.3);
  }
  // LABEL GRADIENT BORDER
  &:after {
      content: "";
      position: absolute;
      display: block;
      width: 164px;
      height: 84px;
      border-radius: 42px;
      background: red;
      top: -2px;
      left: -2px;
      z-index: -1;
      background: linear-gradient(to bottom, #969494, #fff);
  }
  
  &:hover {
    cursor: pointer;
  }
  
  &:focus, &:active {
    outline: 0;
  }
}

.on, .off {
  text-transform: uppercase;
  position: absolute;
  left: 17px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2em;
  font-weight: 600;
  z-index: 2;
  -webkit-user-select: none;        
  -moz-user-select: none;
  -ms-user-select: none; 
  letter-spacing: 1px;
  transition: .25s;
}

.on {
  color: transparent;
  text-shadow: 0 1px 0 rgba(255,255,255,0);
}

.off {
  left: initial; 
  right: 17px;
  color: #444;
  text-shadow: 0 1px 0 rgba(255,255,255, 0.2);
}
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External CSS

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External JavaScript

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