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: 25px;
15  user-select: none;
16}
17
18/* Create a custom checkbox */
19.checkmark {
20  position: relative;
21  top: 0;
22  left: 0;
23  height: 1.3em;
24  width: 1.3em;
25  background: black;
26  border-radius: 50px;
27  transition: all 0.7s;
28  --spread: 20px;
29}
30
31/* When the checkbox is checked, add a blue background */
32.container input:checked ~ .checkmark {
33  background: black;
34  box-shadow: -10px -10px var(--spread) 0px #FFD700, 0 -10px var(--spread) 0px #FFD700, 10px -10px var(--spread) 0px #FFD700, 10px 0 var(--spread) 0px #FFD700, 10px 10px var(--spread) 0px #FFD700, 0 10px var(--spread) 0px #FFD700, -10px 10px var(--spread) 0px #FFD700;
35}
36
37/* Create the checkmark/indicator (hidden when not checked) */
38.checkmark:after {
39  content: "";
40  position: absolute;
41  display: none;
42}
43
44/* Show the checkmark when checked */
45.container input:checked ~ .checkmark:after {
46  display: block;
47  animation: checkmark 0.3s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
48}
49
50/* Style the checkmark/indicator */
51.container .checkmark:after {
52  left: 0.45em;
53  top: 0.25em;
54  width: 0.25em;
55  height: 0.5em;
56  border: solid #FFD700;
57  border-width: 0 0.15em 0.15em 0;
58  transform: rotate(45deg);
59}
60
61/* Add animation for checkmark */
62@keyframes checkmark {
63  from {
64    transform: rotate(-45deg) scale(0);
65  }
66
67  to {
68    transform: rotate(45deg) scale(1);
69  }
70}
71
72/* Style the label text */
73.container span {
74  margin-left: 2em;
75  color: black;
76  font-weight: bold;
77}
78