1/* The switch - the box around the slider */
2.switch {
3  font-size: 17px;
4  position: relative;
5  display: inline-block;
6  width: 3.5em;
7  height: 2em;
8}
9
10/* Hide default HTML checkbox */
11.switch .input {
12  opacity: 0;
13  width: 0;
14  height: 0;
15}
16
17/* The slider */
18.slider {
19  position: absolute;
20  cursor: pointer;
21  top: 0;
22  left: 0;
23  right: 0;
24  bottom: 0;
25  background-color: #2e2e2e;
26  transition: .4s;
27  border-radius: 30px;
28}
29
30.slider:before {
31  position: absolute;
32  content: "";
33  height: 1.4em;
34  width: 1.4em;
35  border-radius: 20px;
36  left: 0.3em;
37  bottom: 0.3em;
38  background-color: #4e4;
39  transition: .4s;
40}
41
42.input:checked + .slider {
43  background-color: #000;
44}
45
46.input:focus + .slider {
47  box-shadow: 0 0 1px #000;
48}
49
50.input:checked + .slider:before {
51  transform: translateX(1.5em);
52}