<div class="button">Hover Me (^_^)!!!</div>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #222;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  gap: 10px;
}

@property --hue {
  syntax: "<integer>";
  inherits: true;
  initial-value: 0;
}

:root {
  --bg: #1a1a1a;
  --button-bg: #000;
}
body {
  transform-style: preserve-3d;
  perspective: 800px;
}

.button {
  --border: hsl(var(--hue, 0), 0%, 50%);
  --shadow: hsl(var(--hue, 0), 0%, 80%);
  user-select: none;
  font-size: 2rem;
  padding: 1.25rem 2.5rem;
  border-radius: 0.5rem;
  border: 0.25rem solid;
  color: #fff;
  cursor: pointer;
  outline: transparent;

  background: var(--button-bg);
  border-color: var(--border);
  box-shadow: 0 1rem 2rem -1.5rem var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.button:hover {
  --border: hsl(var(--hue, 0), 80%, 50%);
  --shadow: hsl(var(--hue, 0), 80%, 50%);
  animation: hueJump 0.75s infinite linear;
  transform: rotateY(10deg) rotateX(10deg);
}

.button:active {
  transform: rotateY(10deg) rotateX(10deg) translate3d(0, 0, -15px);
  box-shadow: 0 0rem 0rem 0rem var(--shadow);
  animation-play-state: paused;
}

@keyframes hueJump {
  to {
    --hue: 360;
  }
}