Lava lamp interior

.btn-113 {
  position: relative;
  overflow: hidden;
  font: 700 15px/1 system-ui,sans-serif;
  color: #fff;
  background: #7c2d12;
  border: 0;
  border-radius: 999px;
  padding: 14px 32px;
  cursor: pointer;
  isolation: isolate
}
.btn-113::before,.btn-113::after {
  content: "";
  position: absolute;
  width: 70%;
  height: 200%;
  top: -50%;
  left: -20%;
  border-radius: 45% 55% 60% 40%/50% 40% 60% 50%;
  background: #f97316;
  filter: blur(6px);
  opacity: .75;
  z-index: -1;
  animation: lava113 5s ease-in-out infinite alternate
}
.btn-113::after {
  left: 50%;
  background: #facc15;
  animation-delay: -2.5s
}
.btn-113:hover::before,.btn-113:hover::after {
  animation-duration: 2s
}
.btn-113:focus-visible {
  outline: 2px solid #f97316;
  outline-offset: 4px
}
.btn-113:active {
  transform: scale(.97)
}
@keyframes lava113 {
  to {
    transform: translate(20%,10%) rotate(40deg);
    border-radius: 55% 45% 40% 60%/40% 60% 40% 60%
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn-113, .btn-113 * { animation: none; transition: none; }
}

<button class="btn-113">Melt</button>