switch

switch

HTML

<div class="center">
  <input type="checkbox" value="1">
  <input type="checkbox" value="2">
</div>

CSS

body {
  margin: 0;
  padding: 0;
  background: #f3f3f3;
}
.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

input[type="checkbox"] {
  width: 200px;
  height: 100px;
  -webkit-appearance: none;
  -moz-appearance: none;
  background: #c6c6c6;
  outline: none;
  border-radius: 50px;
  box-shadow: inset 0 0 5px rgba(0,0,0, .2);
  transition: 0.5s;
  position: relative;
}
input:checked[type="checkbox"] {
  background: #02a9f4;
}
input[type="checkbox"]::before {
  content: '';
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  top: 0;
  left: 0;
  background: #fff;
  transform: scale(1.1);
  box-shadow: 0 2px 5px rgba(0,0,0, .2);
  transition: 0.5s;
}
input:checked[type="checkbox"]::before {
  left: 100px;
}

JavaScript

const inputs = [...document.querySelectorAll("input")]
const colors = {
  "0": "#03f3f3",
  "1": "#00ff00",
  "2": "#ccff00"
}

inputs.forEach(input => {
  input.addEventListener('click', () => {
    document.body.style.backgroundColor = inputs.some(i => i.checked) 
    	? colors[input.value]
      : colors["0"]
  })
})