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                I ❤ CSS


                /* Generate a default background based on any hue */
body {
  --bg-hue: 270; /* rebeccapurple */

* {
  /* or override any individual color directly */
  --bg-color: hsl(var(--bg-hue), 50%, 40%);
  --bg-tint: hsla(var(--bg-hue), 50%, 60%, 0.25);
  --bg-shade: hsla(var(--bg-hue), 50%, 20%, 0.25);

  /* this is the internal logic that creates your angled tint/shade background */
      var(--bg-tint) 30%,
      transparent 30%
      var(--bg-shade) 30%,
      transparent 30%
  /* Creating a final "output" variable acts like a function return */
  --bg: var(--bg-image) var(--bg-color);
  /* Applying that value to a property creates a mixin */
  /* Since the initial return is invalid, nothing happens unless we set a --bg-hue */
  background: var(--bg);

/* Just the layout */
* { box-sizing: border-box; }

body {
  display: grid;
  align-content: center;
  justify-content: center;
  min-height: 100vh;  
  padding: calc(2em + 10vmin);
  font-size: calc(100% + 2vw);