<button class="btn-31">
    <span class="text-container">
      <span class="text">Button</span>
    </span>
  </button>

html {
  font-size: 50px;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  display: grid;
  place-items: center;
  
  background: #0f172a;
}


.btn-31 {
  display: block;
  box-sizing: border-box;
  padding: 1.5rem 3.5rem;

  position: relative;
  
  background: none;
  color: white;

  text-transform: uppercase;
  border: 1px solid currentColor;
  
  --progress: 100%;
  
}

.btn-31:before {
  content: "";
  z-index: -1;

  position: absolute;
  inset: 0;


  background: white;
  clip-path: polygon(
    100% 0,
    var(--progress) var(--progress),
    0 100%,
    100% 100%
  );
  transition: clip-path 0.2s;
}
.btn-31:hover {
  --progress: 0%;
}

.btn-31 .text-container {
  display: block;
  position: relative;
  overflow: hidden;
}
.btn-31 .text {
  display: block;
  position: relative;
  font-size: 1rem;
  font-weight: 900;
  mix-blend-mode: difference;
}
.btn-31:hover .text {
  animation: move-up-alternate 0.3s forwards;
  will-change: transform;
}

@keyframes move-up-alternate {
  from {
    transform: translateY(0%);
  }
  50% {
    transform: translateY(80%);
  }
  51% {
    transform: translateY(-80%);
  }
  100% {
    transform: translateY(0%);
  }
}