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                @property --d{
  syntax: '<angle>';
  inherits: true;
  initial-value: 0deg;

button {
  width: 200px;
  color: #fff;
  background: none;
  border: none;
  border-radius: 20px; 
  position: relative;
  z-index: 0;
  transition: .3s;
  cursor: pointer;
button:before {
  content: "";
  position: absolute;
  inset: -8px;
  padding: 8px;
  border-radius: 28px; 
  background: conic-gradient(from var(--d,0deg),
        #ff53bb ,
        #0000 30deg 120deg,
        #00f8d3 150deg 180deg,
        #0000 210deg 300deg,
        #ff53bb 330deg
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: intersect
button:after {
  content: "";
  position: absolute;
  inset: -100px;
    radial-gradient(80px at left  150px top    120px,#ff53bb 98%,#0000),
    radial-gradient(80px at right 150px bottom 120px,#00f8d3 98%,#0000);
  filter: blur(60px);
  opacity: .5;

button:after {
  transition:.5s, 99999s 99999s transform, 99999s 99999s --d;
button:hover {
  box-shadow: 0 0 0 1px #666;

button:hover:after {
  transform: rotate(3600deg);
  transition: .5s,60s linear transform;
button:hover:before {
  --d: 3600deg;
  transition: .5s,60s linear --d;
button:hover:before {
  background-color: #222;

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-content: center;
  grid-auto-flow: column;
  background-color: #1b1b1c;