body {
  margin:0;
  padding:0;
  background:#151515;
}

.center {
  position:absolute;
  left:50%;
  top:50%;
  transform:translate(-50%, -50%);
}

input[type="checkbox"] {
  margin:10px;
  position:relative;
  width:120px;
  height:40px;
  -webkit-appearance: none;
  background: linear-gradient(0deg, #333, #000);
  outline: none;
  border-radius: 20px;
  box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

input:checked[type="checkbox"]:nth-of-type(1) {
  background: linear-gradient(0deg, #0000b3, #000066);
  box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

input:checked[type="checkbox"]:nth-of-type(2) {
  background: linear-gradient(0deg, #0000b3, #000066);
  box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

input[type="checkbox"]:before {
  content:'';
  position:absolute;
  top:0;
  left:0;
  width:80px;
  height:40px;
  background: linear-gradient(0deg, #000, #6b6b6b);
  border-radius: 20px;
  box-shadow: 0 0 0 1px #232323;
  transform: scale(.98,.96);
  transition:.5s;
}

input:checked[type="checkbox"]:before {
  left:40px;
}

input[type="checkbox"]:after{
  content:'';
  position:absolute;
  top:calc(50% - 2px);
  left:70px;
  width:4px;
  height:4px;
  background: linear-gradient(0deg, #6b6b6b, #000);
  border-radius: 50%;
  transition:.5s;
}

input:checked[type="checkbox"]:after {
  left:110px;
}