Morphing Loader

<div class="morphing-loader"></div>

.morphing-loader {
  width: 60px;
  height: 60px;
  background: linear-gradient(45deg, #667eea, #764ba2, #f093fb, #f5576c);
  background-size: 400% 400%;
  border-radius: 50%;
  animation: morph 2s ease-in-out infinite, gradient 4s ease infinite;
  position: relative;
}
@keyframes morph {
  0%, 100% {
    border-radius: 50%;
    transform: rotate(0deg);
  }
  25% {
    border-radius: 0 50% 50% 50%;
    transform: rotate(90deg);
  }
  50% {
    border-radius: 50% 0 50% 50%;
    transform: rotate(180deg);
  }
  75% {
    border-radius: 50% 50% 0 50%;
    transform: rotate(270deg);
  }
}
@keyframes gradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}