1/* Hide the default checkbox */
2.container input {
3  position: absolute;
4  opacity: 0;
5  cursor: pointer;
6  height: 0;
7  width: 0;
8}
9
10.container {
11  display: block;
12  position: relative;
13  cursor: pointer;
14  font-size: 20px;
15  user-select: none;
16}
17
18/* Create a custom checkbox */
19.checkmark {
20  position: relative;
21  top: 0;
22  left: 0;
23  height: 1.34em;
24  width: 1.3em;
25  background-color: #ccc;
26  transition: .4s ease-in-out;
27  border-radius: 50%;
28}
29
30.checkmark:hover {
31  background-color: grey;
32}
33
34/* When the checkbox is checked, add a blue background */
35.container input:checked ~ .checkmark {
36  background-color: #2196F3;
37}
38
39/* Create the checkmark/indicator (hidden when not checked) */
40.checkmark:after {
41  content: "";
42  position: absolute;
43  display: none;
44}
45
46/* Show the checkmark when checked */
47.container input:checked ~ .checkmark:after {
48  display: block;
49}
50
51/* Style the checkmark/indicator */
52.container .checkmark:after {
53  left: 0.25em;
54  top: 0.29em;
55  width: 0.50em;
56  height: 0.50em;
57  border: solid white;
58  background-color: white;
59  border-radius: 50%;
60}