<div class="box">BUTTON</div>

html, body {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: skyblue;
}

.box {
  background: linear-gradient(to right, gold, darkorange);
  color: white;
  --width: 250px;
  --height: calc(var(--width) / 3);
  width: var(--width);
  height: var(--height);
  text-align: center;
  line-height: var(--height);
  font-size: calc(var(--height) / 2.5);
  font-family: sans-serif;
  letter-spacing: 0.2em;
  border: 1px solid darkgoldenrod;
  border-radius: 2em;
  transform: perspective(500px) rotateY(-15deg);
  text-shadow: 6px 3px 2px rgba(0, 0, 0, 0.2);
  box-shadow: 2px 0 0 5px rgba(0, 0, 0, 0.2);
  transition: 0.5s;
  position: relative;
  overflow: hidden;
}

.box:hover {
  transform: perspective(500px) rotateY(15deg);
  text-shadow: -6px 3px 2px rgba(0, 0, 0, 0.2);
  box-shadow: -2px 0 0 5px rgba(0, 0, 0, 0.2);
}

.box::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, transparent, white, transparent);
  left: -100%;
  transition: 0.5s;
}

.box:hover::before {
  left: 100%;
}