Fluid Wave Animation

.fluid-wave {
  width: 300px;
  height: 150px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 16px;
}
.fluid-wave::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  top: -250px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.1);
  border-radius: 45%;
  animation: wave 8s linear infinite;
}
.fluid-wave::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  top: -240px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.05);
  border-radius: 40%;
  animation: wave 10s linear infinite;
}
@keyframes wave {
  0% {
    transform: translateX(-50%) rotate(0deg);
  }
  100% {
    transform: translateX(-50%) rotate(360deg);
  }
}