$colors: (
  #feda3e,
  #cc6698,
  #0869ad,
  #ff8300,
  #7A86b8,
  #f05133,
  #2aa9e0,
  #71bf45,
  #ef0e39,
  #9e79d7,
);
$color: nth($colors, random(length($colors)));

html {
  background: radial-gradient(ellipse at center, $color 0%, darken($color, 50%) 100%);
  overflow: hidden;
}