body {
  margin: auto;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  overflow: auto;
  background: linear-gradient(315deg, rgba(101,0,94,1) 3%, rgba(60,132,206,1) 38%, rgba(48,238,226,1) 68%, rgba(255,25,25,1) 98%);
  animation: gradient 15s ease infinite;
  background-size: 400% 400%;
  background-attachment: fixed;
}

@keyframes gradient {
  0% {
    background-position: 0% 0%;
  }

  50% {
    background-position: 100% 100%;
  }

  100% {
    background-position: 0% 0%;
  }
}

.wave {
  background: rgb(255 255 255 / 25%);
  border-radius: 1000% 1000% 0 0;
  position: fixed;
  width: 200%;
  height: 12em;
  animation: wave 10s -3s linear infinite;
  transform: translate3d(0, 0, 0);
  opacity: 0.8;
  bottom: 0;
  left: 0;
  z-index: -1;
}

  .wave:nth-of-type(2) {
    bottom: -1.25em;
    animation: wave 18s linear reverse infinite;
    opacity: 0.8;
  }

  .wave:nth-of-type(3) {
    bottom: -2.5em;
    animation: wave 20s -1s reverse infinite;
    opacity: 0.9;
  }

@keyframes wave {
  2% {
    transform: translateX(1);
  }

  25% {
    transform: translateX(-25%);
  }

  50% {
    transform: translateX(-50%);
  }

  75% {
    transform: translateX(-25%);
  }

  100% {
    transform: translateX(1);
  }
}