Aura

aura.markdown

Aura

Inspired by a CSS trick I didn't know which Robin Rendle tweeted about: https://twitter.com/robinrendle/status/1050794670819663873

A Pen by root on CodePen.

License.

index.html

<ul>
  <li></li>
  <li></li>
  <li></li>
</ul> 

style.scss

$c: cyan;
$m: magenta;
$y: yellow;
$k: black;

* {
  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: $k;
}

ul {
  width: 50vw;
  height: 50vw;
  position: relative;
  &::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: radial-gradient(circle at top left, lighten($k, 10%), $k);
    border-radius: 50%;
  }
  li {
    border-radius: 50%;
    background-color: $y;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    animation: aura 30s infinite linear;
    mix-blend-mode: screen;
    filter: blur(1vw);
    &:nth-child(2) {
      background-color: $m;
      animation-delay: -10s;
    }
    &:nth-child(3) {
      background-color: $c;
      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);
  }
}