selector{
    --first-color: #5ddcff; 
    --second-color: #3c67e3;
    --third-color: #4e00c2;
}
@property --rotate {
  syntax: "<angle>";
  initial-value: 132deg;
  inherits: false;
}
selector::before, selector::after{
    opacity: 0;
    content: "";
    transition: all 0.5s ease-in-out;
}
selector:hover::before, selector:hover::after{
    position: absolute;
    z-index: -1;
    background-image: linear-gradient(
    var(--rotate)
    , var(--first-color), var(--second-color) 43%, var(--third-color));
    animation: spin 2.5s linear infinite;
    opacity: 1;
}
selector:hover::before {
  width: 104%;
  height: 104%;
  border-radius: 8px;
  top: -1%;
  left: -2%;
  right: -1%;
}
selector:hover::after {
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  width: 100%;
  transform: scale(0.9);
  filter: blur(70px);
}
@keyframes spin {
  0% {
    --rotate: 0deg;
  }
  100% {
    --rotate: 360deg;
  }
}