1.button {
2  background: radial-gradient(ellipse at top, white, blue, black, black);
3  color: white;
4  position: relative;
5  background-size: 130% 130%;
6  background-position: center center;
7}
8
9.button:hover {
10  background: radial-gradient(ellipse at top, white, blue, black, black);
11  animation: gradient 4s;
12  animation-fill-mode: forwards;
13  /* background-position: center center; */
14}
15
16.button:hover:after {
17  content: "";
18  position: absolute;
19  inset: -.625em;
20  background: radial-gradient(ellipse at top, white, blue, black, black);
21  /* background-position: center center; */
22  filter: blur(1.5em);
23  z-index: -1;
24  animation: gradient 4s;
25  animation-fill-mode: forwards;
26}
27
28@keyframes gradient {
29  0% {
30    background-size: 130% 130%;
31  }
32
33  100% {
34    background-size: 200% 200%;
35  }
36}
37