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: #fff;
26  border: 1px solid #adb5bd;
27  transition: .4s;
28  border-radius: 30px;
29}
30
31.slider:before {
32  position: absolute;
33  content: "";
34  height: 1.4em;
35  width: 1.4em;
36  border-radius: 20px;
37  left: 0.27em;
38  bottom: 0.25em;
39  background-color: #adb5bd;
40  transition: .4s;
41}
42
43input:checked + .slider {
44  background-color: #007bff;
45  border: 1px solid #007bff;
46}
47
48input:focus + .slider {
49  box-shadow: 0 0 1px #007bff;
50}
51
52input:checked + .slider:before {
53  transform: translateX(1.4em);
54  background-color: #fff;
55}