GizDevCraft Editor - Building a Responsive Nav with Flex

HTML

CSS

<main class="lesson-shell flexbox-playground">
  <section class="demo-card">
    <span class="eyebrow">Building a Responsive Nav with Flex</span>
    <h1>Flexbox practice area</h1>
    <p>Edit the CSS tab, resize the preview, and watch how the main axis, cross axis, wrapping, and item sizing change.</p>

    <nav class="nav" aria-label="Flexbox demo navigation">
      <a class="nav__brand" href="#cards">GizDevCraft</a>
      <a href="#cards">Cards</a>
      <a href="#media">Media</a>
      <a href="#toolbar">Toolbar</a>
    </nav>

    <div class="cluster demo-target" id="cards">
      <article class="box card card--primary featured">
        <div class="card__body">Featured flex item with longer content.</div>
        <button class="card__actions" type="button">Start</button>
      </article>
      <article class="box card"><div class="card__body">Lesson</div><button class="card__actions" type="button">Open</button></article>
      <article class="box card"><div class="card__body">Practice</div><button class="card__actions" type="button">Try</button></article>
      <article class="box card"><div class="card__body">Review</div><button class="card__actions" type="button">Check</button></article>
    </div>

    <article class="media" id="media">
      <div class="media__image" aria-hidden="true">FX</div>
      <div class="media__body">
        <h2>Media object</h2>
        <p>The image keeps its size while this text area uses remaining space.</p>
      </div>
    </article>

    <div class="toolbar" id="toolbar">
      <button type="button">Save</button>
      <button type="button">Preview</button>
      <span class="toolbar__spacer"></span>
      <button type="button">Publish</button>
    </div>
  </section>
</main>

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f8fafc;
  color: #111827;
}

.lesson-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.demo-card {
  width: min(760px, 100%);
  background: #ffffff;
  border: 1px solid #dbe3ef;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 18px 45px rgb(15 23 42 / .10);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: .75rem;
  color: #4f46e5;
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 .75rem;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

p {
  color: #536471;
  line-height: 1.7;
}

button {
  border: 0;
  border-radius: 8px;
  padding: .75rem 1rem;
  background: #4f46e5;
  color: white;
  font-weight: 800;
  cursor: pointer;
}

.demo-target {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.box {
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  padding: 1.25rem;
  background: #f8fafc;
  font-weight: 800;
}

.featured {
  background: #eef2ff;
  color: #3730a3;
}
.nav, .toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; margin-block: 1rem; }
.nav__brand, .toolbar__spacer { margin-inline-end: auto; }
.card { display: flex; flex-direction: column; gap: .75rem; }
.card__body { flex: 1; }
.media { display: flex; align-items: flex-start; gap: 1rem; margin-block: 1.5rem; text-align: left; }
.media__image { flex: 0 0 4.5rem; min-height: 4.5rem; display: grid; place-items: center; border-radius: 8px; background: #dbeafe; color: #1d4ed8; font-weight: 800; }
.media__body { flex: 1 1 auto; }

/* Lesson code: Building a Responsive Nav with Flex */
.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav__brand { margin-inline-end: auto; }

@media (max-width: 640px) {
  .nav__links { flex-basis: 100%; }
}

console.log('Flexbox editor starter loaded for ' + "Building a Responsive Nav with Flex");