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                <article class="card">
  <h1 class="card__heading">CSS for developers</h1>
  <div class="card__body">Computers have become ubiquitous in almost every facet of our lives. At work, desk jockeys spend hours in front of their desktops, while delivery people scan bar codes with handhelds and workers in the field stay in touch with the central office via their notebooks. At home, we rely on our….</div>
  <a href="#" class="card__action">Action link</a>


                // Light mode
// ------------------------------------------------------------
:root {
  // HSL
  --hue: 205;
  --saturation: 100%;
  --lightness: 50%;
  // Color palette
  --primary-color: hsl(var(--hue), var(--saturation), var(--lightness));
  --secondary-color: hsl(calc(var(--hue) + 180), var(--saturation), var( --lightness));
  // Scaffolding
  --body-bg: hsl(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 5));
  --border-width: 1px;
  --font-family: "Source Sans Pro";
  --font-family-alt: "Quattrocento";
  --line-height-base: 1.45;
  // Card
  --card-width: 532px;
  --card-padding: 24px 34px 42px; 
  --card-bg: var(--body-bg);
  --card-border-color: hsla(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 1.8), 1);
  --card-font-family: var(--font-family);
  --card-font-size: 1rem;
  --card-text-color: hsl(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 0.7));
  --card-link-padding: 6px 18px;
  --card-link-bg: var(--secondary-color);
  --card-link-color: hsl(calc(var(--hue) + 180), var(--saturation), calc(var( --lightness) * 3));
  --card-link-family: var(--font-family);
  --card-link-size: 1.25rem;
  --card-link-decoration: none;
  --card-shadow: hsla(0, 0%, 0%, 0.1);

// Dark mode
// ------------------------------------------------------------
@media (prefers-color-scheme: dark) {
  :root {
    // HSL
    --hue: 120;
    --lightness: 70%;
    // Scaffolding
    --body-bg: hsl(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 0.25));
    --border-width: 3px;
    --line-height-base: 1.55;
    // Card
    --card-width: 640px;
    --card-padding: 34px 42px; 
    --card-bg: hsl(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 0.325));
    --card-border-color: hsla(var(--hue), calc(var(--saturation) * 0), calc(var(--lightness) * 1.8), 0.05);
    --card-font-family: var(--font-family-alt);
    --card-font-size: 1.2rem;
    --card-text-color: hsl(var(--hue), calc(var(--saturation) * 0), var(--lightness));
    --card-link-padding: 0;
    --card-link-bg: null;
    --card-link-color: hsl(calc(var(--hue) + 180), var(--saturation), calc(var( --lightness) * 1.1));
    --card-link-size: 1.55rem;
    --card-link-decoration: underline;
    --card-shadow: hsla(0, 0%, 0%, 0.7);

// Global styles
// ------------------------------------------------------------
* { box-sizing: border-box }

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: var(--body-bg);
  line-height: var(--line-height-base);

// Card
// ------------------------------------------------------------
.card {
  width: var(--card-width);
  border: var(--border-width) solid var(--card-border-color);
  border-radius: 6px;
  padding: var(--card-padding);
  background-color: var(--card-bg);
  color: var(--card-text-color);
  font-family: var(--card-font-family);
  font-size: var(--card-font-size);
  box-shadow: 0 2px 15px var(--card-shadow);

.card__heading {
  margin-bottom: 1rem;
  color: var(--primary-color);
  font-family: "Alfa Slab One";
  font-size: 2.6rem;
  font-weight: 400;

.card__body {
  margin-bottom: 32px;

.card__action {
  border: 0;
  border-radius: 5px;
  padding: var(--card-link-padding);
  background-color: var(--card-link-bg);
  color: var(--card-link-color);
  font-family: var(--card-link-family);
  font-size: var(--card-link-size);
  font-weight: bold;
  text-decoration: var(--card-link-decoration);