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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <body class="primary-layout">
  <main>
    <h1>Smart design patterns with container queries</h1>
    <section class='lets-get-griddy'>
      <h2>Featured Articles</h2>

      <div class="grid-auto-fit">

        <article class="card">
          <img src='https://images.unsplash.com/photo-1523380262778-076eb862d38f?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE3MTgwMjc2NTd8&ixlib=rb-4.0.3&q=70&w=800' alt='desk in a dark room, with a lamp illuminating a closed laptop'>
          <h3>The Art of Minimalism</h3>
          <p>Dive into the art of minimalism in interior design, exploring how less can indeed be more.</p>
          <p> <a href="#">Read more about minimalism</a></p>
        </article>

        <article class="card">
          <h3>Color Theory in Interior Design</h3>
          <p>Discover the profound impact of color choices on mood and aesthetics in interior design.</p>
          <p> <a href="#">Read more about color theory</a></p>
        </article>

        <article class="card">
          <h3>Article title</h3>
          <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quam, eius?</p>
          <p> <a href="#">Read more about XYZ</a></p>
        </article>

        <article class="card">
          <h3>Maximizing Small Spaces</h3>
          <p>Learn creative strategies to maximize small spaces, making them feel larger and more inviting.</p>
          <p> <a href="#">Read more about maximizing small spaces</a></p>
        </article>

        <article class="card">
          <h3>Eco-Friendly Interiors</h3>
          <p>Explore how to create stunning interiors using eco-friendly materials and sustainable practices.</p>
          <p> <a href="#">Read more about eco-friendly interior design</a></p>
        </article>

        <article class="card">
          <h3>The Influence of Art Deco in Modern Homes</h3>
          <p>Examine the enduring influence of Art Deco on modern home design and how to incorporate it.</p>
          <p> <a href="#">Read more about using Art Deco in modern homes</a></p>
        </article>

        <article class="card">
          <h3>Article title</h3>
          <p>Lorem ipsum, dolor sit amet consectetur adipisicing elit. Quam, eius?</p>
          <p> <a href="#">Read more about XYZ</a></p>
        </article>

        <article class="card">
          <h3>Incorporating Plants into Your Decor</h3>
          <p>Discover how to breathe life into your home by incorporating plants into your decor.</p>
          <p> <a href="#">Read more about using plants in your decor</a></p>
        </article>

        <article class="card">
          <h3>The Psychology of Interior Design</h3>
          <p>Understand the psychology behind interior design and how it affects our emotions and behavior.</p>
          <p> <a href="#">Read more about the psychology of interior design</a></p>
        </article>

        <article class="card">
          <h3>Trends in Kitchen Design</h3>
          <p>Stay up-to-date with the latest trends in kitchen design, from smart appliances to color schemes.</p>
          <p> <a href="#">Read more about kitchen design trends</a></p>
        </article>

        <article class="card">
          <article>
            <h3>Creating a Home Office That Works</h3>
            <p>Create a home office that boosts productivity and balances work with home life.</p>
            <p><a href="#">Read more about improving your home office</a></p>
          </article>
        </article>
      </div>
    </section>
    <section>
      <h2>Some other content that follows</h2>
      <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Fugit vitae delectus quo labore quidem corrupti ipsam, quasi velit ex temporibus amet numquam? Necessitatibus corrupti error inventore in. Voluptate, esse dolorum!</p>
      <p>Ratione quo, accusantium commodi unde consequatur quidem dolorem numquam molestiae officia impedit, pariatur iure corrupti quaerat explicabo molestias. Impedit deleniti ipsam numquam voluptatem laboriosam dolorem atque deserunt quidem reprehenderit officia.</p>
      <p>Praesentium quisquam tempora, voluptate animi quos consequatur aliquid ipsa repellat reprehenderit vel enim necessitatibus! Quas quaerat deleniti necessitatibus harum voluptates repellendus, voluptate earum delectus nemo. Nulla, quis. Velit, fugit beatae!</p>
      <p>Eos, aperiam consectetur eius sed excepturi pariatur deserunt incidunt vel voluptatibus officia voluptates voluptatum expedita. Facere consequatur et quo perferendis atque, ducimus libero debitis nobis fugiat corporis quisquam sapiente recusandae?</p>
    </section>
  </main>

</body>
!

CSS 

              
                main {
  container: main / inline-size;
}

.grid-auto-fit {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(30ch, 100%), 1fr));

  container: grid-auto-fit / inline-size;
}

.card:has(> img) {
  border: 2px solid var(--clr-primary-300);

  @container grid-auto-fit (inline-size > calc(30ch * 2 + 1rem)) {
    grid-column: span 2;

    display: grid;
    grid-template-columns: subgrid;
    gap: 0;

    > img {
      grid-column: 2;
      grid-row: 1 / 4;
    }
  }

  @container grid-auto-fit (inline-size > calc(30ch * 4 + 3rem)) {
    grid-column: span 2;
    grid-row: span 2;

    > :not(img) {
      grid-column: 1 / -1;
    }

    > img {
      grid-column: 1 / -1;
      grid-row: 1;
    }
  }
}

@layer general-styling {
  html {
    color-scheme: dark light;
    font-family: system-ui;
    line-height: 1.6;
  }

  body {
    font-size: 1.25rem;
    margin: 0;
  }

  img {
    max-width: 100%;
    display: block;
  }

  h1,
  h2,
  h3 {
    font-family: "Playfair Display", serif;
    font-optical-sizing: auto;
    /*     font-style: italic; */
    text-transform: uppercase;
    font-weight: 400;
  }

  h1 {
    font-size: 4rem;
    /*     font-size: round(up, clamp(2rem, 5cqi + .5rem, 5rem), 2rem); */
    line-height: 1.1;
  }

  h2 {
    font-size: 2.5rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  a:not([class]) {
    justify-self: start;
    color: white;
    /*     text-decoration: none; */
    text-underline-offset: 4px;

    transition: background-size 325ms ease, text-decoration 325ms;

    &:hover,
    &:focus-visible {
      text-decoration-color: var(--clr-primary-400);
      background-size: 100% 1px;
    }
  }

  section {
    padding-block: clamp(2rem, 5vb, 6rem);
  }

  .btn {
    display: inline flex;
    padding: 1rem 2rem;
    text-decoration: none;
    cursor: pointer;
    background-color: var(--clr-primary-500);
    color: white;

    &:hover,
    &:focus-visible {
      background-color: var(--clr-primary-600);
    }
  }
}

@layer card-styling-not-specific-for-demo {
  .card {
    --padding: 1rem;

    display: grid;
    background: hsl(0 0% 50% / 0.2);
    background-image: linear-gradient(
      to bottom,
      transparent 50%,
      rgb(0 0 0 / 0.3)
    );
    overflow: hidden;
    border-radius: 0.25rem;

    h2,
    h3 {
      color: var(--clr-primary-200);
    }

    > img {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }

    > :not(img) {
      margin-block-start: 0;
      margin-inline: 1rem;
    }

    > :not(img):first-child {
      margin-block-start: 1rem;
    }

    > :not(img):last-child {
      margin-block-end: 1rem;
    }
  }
}

@layer theme {
  :root {
    --clr-neutral-900: ;

    --clr-primary-600: hsl(22, 60%, 21%);
    --clr-primary-500: hsl(22, 60%, 31%);
    --clr-primary-400: hsl(22, 60%, 41%);
    --clr-primary-300: hsl(22, 60%, 51%);
    --clr-primary-200: hsl(22, 60%, 61%);
  }
}

@layer layout {
  .primary-layout {
    display: grid;
    grid-template-columns:
      [full-width] minmax(2rem, 1fr) [content-start] min(1600px, 100% - 4rem)
      [content-end] minmax(2rem, 1fr);

    & > * {
      grid-column: 2 / -2;
    }
  }
}
!

JS
!
999px

Console