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<button class="liquid-btn">
  <span>Hover Me</span>
  <div class="liquid"></div>
</button>

.liquid-btn {
  position: relative;
  padding: 16px 32px;
  font-size: 18px;
  border-radius: 40px;
  overflow: hidden;
}

.liquid {
  position: absolute;
  inset: 0;
  background:
  linear-gradient(120deg,
  #00f0ff,
  #8a2be2,
  #ff00d4);
}