1.card {
2 width: 190px;
3 height: 254px;
4 --border-radius: 15px;
5 --border-width: 4px;
6 appearance: none;
7 position: relative;
8 padding: 1em 2em;
9 border: 0;
10 background: rgb(5, 5, 22);
11 font-size: 18px;
12 font-weight: 500;
13 color: #fff;
14 z-index: 2;
15 border-radius: 15px;
16}
17
18.card::after {
19 --m-i: linear-gradient(#000, #000);
20 --m-o: content-box, padding-box;
21 content: "";
22 position: absolute;
23 left: 0;
24 top: 0;
25 width: 100%;
26 height: 100%;
27 padding: var(--border-width);
28 border-radius: var(--border-radius);
29 background-image: conic-gradient(
30		#488cfb,
31		#29dbbc,
32		#ddf505,
33		#ff9f0e,
34		#e440bb,
35		#655adc,
36		#488cfb
37	);
38 -webkit-mask-image: var(--m-i), var(--m-i);
39 mask-image: var(--m-i), var(--m-i);
40 -webkit-mask-origin: var(--m-o);
41 mask-origin: var(--m-o);
42 -webkit-mask-clip: var(--m-o);
43 mask-composite: exclude;
44 -webkit-mask-composite: destination-out;
45 filter: hue-rotate(0);
46 animation: rotate-hue linear 500ms infinite;
47 animation-play-state: paused;
48}
49
50.card:hover::after {
51 animation-play-state: running;
52}
53
54@keyframes rotate-hue {
55 to {
56  filter: hue-rotate(1turn);
57 }
58}
59
60.card,
61.card::after {
62 box-sizing: border-box;
63}
64
65.card:active {
66 --border-width: 5px;
67}