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CSS

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HTML 

              
                <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Out with the old...</title>
<link rel="stylesheet" href="path-to-style.css">
<meta name="description" content="We are going to refine this document down to a good starting point for all html5 projects moving forward." />
<meta name="author" content="Thomas Wallace" />
<link rel="shortcut icon" href="/favicon.ico" />
</head>
<body>
<main class="cf">
  <header class="primary">
    <h1>Out with the old...</h1>
    <h2>Beginning the transistion to HTML5</h2>
    <nav class="primary">
      <ul>
        <li><a href="#">LINK</a></li>
        <li><a href="#">LINK</a></li>
        <li><a href="#">LINK</a></li>
      </ul>
    </nav>
  </header>
  <section id="content">
    <section id="blog">
      <article class="post">
        <header>
        <time datetime="2024-1-25">January 25, 2024</time>
        <h1> <a href="#" rel="bookmark" title="link to this post">The Rebel Force</a> </h1>
        </header>  
        <p>Hey, Luke! May the Force be with you. Alderaan? I'm not going to Alderaan. I've got to go home. It's late, I'm in for it as it is. Obi-Wan is here. The Force is with him. What?! You don't believe in the Force, do you?</p>
        <h2>The Sith Lords</h2>
        <p>You're all clear, kid. Let's blow this thing and go home! I care. So, what do you think of her, Han? You are a part of the Rebel Alliance and a traitor! Take her away! You don't believe in the Force, do you?</p>
        <ul>
          <li>You are a part of the Rebel Alliance and a traitor! Take her away!</li>
          <li>Hey, Luke! May the Force be with you.</li>
          <li>What good is a reward if you ain't around to use it? Besides, attacking that battle station ain't my idea of courage. It's more like&hellip;suicide.</li>
        </ul>
        <footer class="post-meta"> Post Tags Go here.... </footer>
      </article>
      <article class="post">
        <header>
        <time datetime="2024-1-25">January 25, 2024</time>
        <h1> <a href="#" rel="bookmark" title="link to this post">The Rebel Force</a> </h1>
        </header>  
        <p>Hey, Luke! May the Force be with you. Alderaan? I'm not going to Alderaan. I've got to go home. It's late, I'm in for it as it is. Obi-Wan is here. The Force is with him. What?! You don't believe in the Force, do you?</p>
        <h2>The Sith Lords</h2>
        <p>You're all clear, kid. Let's blow this thing and go home! I care. So, what do you think of her, Han? You are a part of the Rebel Alliance and a traitor! Take her away! You don't believe in the Force, do you?</p>
        <ul>
          <li>You are a part of the Rebel Alliance and a traitor! Take her away!</li>
          <li>Hey, Luke! May the Force be with you.</li>
          <li>What good is a reward if you ain't around to use it? Besides, attacking that battle station ain't my idea of courage. It's more like&hellip;suicide.</li>
        </ul>
        <footer class="post-meta"> Post Tags Go here.... </footer>
      </article>
      <article class="post">
        <header>
        <time datetime="2024-1-25">January 25, 2024</time>
        <h1> <a href="#" rel="bookmark" title="link to this post">The Rebel Force</a> </h1>
        </header>  
        <p>Hey, Luke! May the Force be with you. Alderaan? I'm not going to Alderaan. I've got to go home. It's late, I'm in for it as it is. Obi-Wan is here. The Force is with him. What?! You don't believe in the Force, do you?</p>
        <h2>The Sith Lords</h2>
        <p>You're all clear, kid. Let's blow this thing and go home! I care. So, what do you think of her, Han? You are a part of the Rebel Alliance and a traitor! Take her away! You don't believe in the Force, do you?</p>
        <ul>
          <li>You are a part of the Rebel Alliance and a traitor! Take her away!</li>
          <li>Hey, Luke! May the Force be with you.</li>
          <li>What good is a reward if you ain't around to use it? Besides, attacking that battle station ain't my idea of courage. It's more like&hellip;suicide.</li>
        </ul>
        <footer class="post-meta"> Post Tags Go here.... </footer>
      </article>
    </section>
    <!--#primary -->
    <aside id="supporting-material">
      <article class="widget">
        <h1>Sample Sidebar Item </h1>
        <p>Quisque justo erat, varius placerat fermentum vel, iaculis vel ligula. Phasellus et elit purus. Curabitur ipsum enim, scelerisque vitae condimentum ac, cursus eget quam. Nullam volutpat dui ut risus pulvinar at fringilla sem tristique. Nulla facilisi. Donec posuere euismod purus, eu scelerisque risus pellentesque eu. Vestibulum sed tincidunt metus. <a href="#">Read More</a>&raquo;</p>
      </article>
      <article class="widget">
        <h1>Sample Sidebar Item </h1>
        <p>Quisque justo erat, varius placerat fermentum vel, iaculis vel ligula. Phasellus et elit purus. Curabitur ipsum enim, scelerisque vitae condimentum ac, cursus eget quam. Nullam volutpat dui ut risus pulvinar at fringilla sem tristique. Nulla facilisi. Donec posuere euismod purus, eu scelerisque risus pellentesque eu. Vestibulum sed tincidunt metus. <a href="#">Read More</a>&raquo;</p>
      </article>
      <article class="widget">
        <h1>Sample Sidebar Item </h1>
        <p>Quisque justo erat, varius placerat fermentum vel, iaculis vel ligula. Phasellus et elit purus. Curabitur ipsum enim, scelerisque vitae condimentum ac, cursus eget quam. Nullam volutpat dui ut risus pulvinar at fringilla sem tristique. Nulla facilisi. Donec posuere euismod purus, eu scelerisque risus pellentesque eu. Vestibulum sed tincidunt metus. <a href="#">Read More</a>&raquo;</p>
      </article>
    </aside>
    <!--#secondary --> 
  </section>
  <!--#content -->
  <footer class="primary">
    <p>&copy; 2024 <a href="#">Thomas Wallace</a></p>
  </footer>
</main>
<!--.container -->
</body>
</html>
!

CSS 

              
                /* apply a natural box layout model to all elements, but allowing components to change */
html {
  box-sizing: border-box;
}
*,
*:before,
*:after {
  box-sizing: inherit;
}

.cf:before,
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.cf:after {
    clear: both;
}

main{
width:80vw;  
display:grid;
grid-template-columns: repeat(10, [col-] 1fr);
grid-template-rows:auto;  
margin:auto;  
gap:20px;
border:1px solid #000;
padding:20px;  
}

header.primary{
  background: rgba(0, 0, 0, 0.4);
  grid-column: 1 / 11;
  grid-row: 1 / 2;
}

#content{
  grid-column: 1 / 11;
  grid-row: 2 / 3;
  display:grid;
  grid-template-columns: subgrid;
  grid-template-rows: subgrid;
}

footer.primary{
  background: rgba(0, 0, 0, 0.4);
  grid-column: 1 / 11;
  grid-row: 3 / 4;
}

#blog{
  background: rgba(0, 0, 0, 0.6);
  grid-column:1 / 8;
}

aside{
  background: rgba(0, 0, 0, 0.3);
  grid-column:8 / 11;
}
!

JS
!
999px

Console