* {
  margin: 0;
  padding: 0;
  color: inherit;
  text-decoration: none;
  list-style: none;
  outline: none;
  box-sizing: border-box;
}

body {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: black;
}

ul {
  width: 50vw;
  height: 50vw;
  position: relative;
}
ul::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: radial-gradient(circle at top left, #1a1a1a, black);
  border-radius: 50%;
}
ul li {
  border-radius: 50%;
  background-color: yellow;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  animation: aura 30s infinite linear;
  mix-blend-mode: screen;
  filter: blur(1vw);
}
ul li:nth-child(2) {
  background-color: magenta;
  animation-delay: -10s;
}
ul li:nth-child(3) {
  background-color: cyan;
  animation-direction: reverse;
  animation-delay: -20s;
}

@keyframes aura {
  25%,
  75% {
    border-radius: 60% 40% 40% 60% / 60% 40% 60% 40%;
  }
  50% {
    border-radius: 40% 60% 60% 40% / 40% 60% 40% 60%;
  }
  100% {
    transform: rotate(360deg);
  }
}