i { background: #359 }
b { background: #335599 }
u { background: rgba(144, 0, 0, .5) }
s { background: hsl(0, 100%, 50%) }

$color1: #359;
$color2: #335599;
$color3: rgba(144, 0, 0, .5);
$color4: hsl(0, 100%, 50%);

/*
 * #123, #456
 */

// #123456

ul {
  color: white;

  li {
    color: yellow;
    background: black;
  }
}