@property --rotate {
  syntax: "<angle>";
  initial-value: 132deg;
  inherits: false;
}

:root {
  --card-height: 100px;
  --card-width: 120px;
}

.card-border {
  background: #191c29;
  position: relative;
  border-radius: 8px;
  justify-content: center;
  align-items: center;
  text-align: center;
  display: flex;
  font-size: 1.5em;
  color: rgb(88 199 250 / 0%);
}

.card-border:hover {
  color: rgb(88 199 250 / 100%);
  transition: color 1s;
}

.card-border::before {
  content: "";
  width: 102%;
  height: 102%;
  border-radius: 14px;
  background-image: linear-gradient(
    var(--rotate)
    , #5ddcff, #3c67e3 43%, #4e00c2);
    position: absolute;
    z-index: 0;
    top: -1%;
    left: -1%;
    animation: spin 2.5s linear infinite;
}

.card-border::after {
  position: absolute;
  content: "";
  top: calc(var(--card-height) / 6);
  left: 0;
  right: 0;
  z-index: -1;
  height: 100%;
  width: 100%;
  margin: 0 auto;
  transform: scale(0.8);
  filter: blur(calc(var(--card-height) / 6));
  background-image: linear-gradient(
    var(--rotate)
    , #5ddcff, #3c67e3 43%, #4e00c2);
    opacity: 1;
  transition: opacity .5s;
  animation: spin 2.5s linear infinite;
}

@keyframes spin {
  0% {
    --rotate: 0deg;
  }
  100% {
    --rotate: 360deg;
  }
}

.card-border .play-btn {
  display: none;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  position: absolute;
  border-radius: 13px;
}
.card-border .play-btn i {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}