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HTML 

              
                <div class="site">
  <header class="header">
    <h2>Website Design</h2>
  </header>
  <aside class="aside">
    <h2>Aside Panel</h2>
    <p>There are endless possiblites what a designer can do when using grids and flexbox. Using flex and grid also cuts down (usually) on the size of CSS that is written making easier to understand what a person was doing though commenting the CSS is still a good idea.</p>
  </aside>
  <section class="content">
    <nav class="navigation">
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">News</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
    <article class="main">
      <h1>How to Design a Website</h1>
      <p>Begin designing the website with the smallest screen size possible which is normally a smartphone then work yourself up to bigger screen sizes. An added benifit of doing it this way is you web page will look good if the person is using a non-standard device. With smaller screens concentrate on the content as much as possible as that is the reason a person goes to your website to begin with.</p>
      <p>Once you get the basic design done then it is relatively easy to change the appearance (design) of the website. Using Grids and Flexbox makes it easy to make changes on the fly compared to doing it the old traditional way. Most current browers support Grids and Flexbox along with Media Queries. Internet Explorer probably doesn't though that is becoming obsolete and there are work arounds if you really need to design for IE.</p>
    </article>
  </section>
  <footer class="colophon">
    <p>FOOTER</p>
  </footer>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
main,
menu,
nav,
section,
summary {
  display: block;
}

h1,
h2 {
  font-family: Georgia, serif;
  font-size: 1.8em;
  line-height: 2;
}

p {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.2em;
  line-height: 1.5;
}

/* Design for Smartphone First */

body {
  margin: 0;
}

/* I usually put this class in the body ELEMENT */
.site {
  width: 100%;
}

.header {
  background-color: #ccc;
  width: 100%;
  height: 6.25em;
  padding: 1.25em;
  margin: 0 auto;
}

.header h2 {
  text-align: center;
}

.aside {
  background-color: lightblue;
  width: 100%;
  height: auto;
  padding: 0 1.25em;
  margin: 1.250em auto;
}

.content {
  display: block;
  width: 100%;
  height: auto;
  background-color: #f8f8ff;
  padding: 1.25em;
  margin: 0 auto;
}

.content nav {
  background-color: #f1f1f1;
}

.content nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  width: 12.5em;
}

.content nav li a {
  display: block;
  color: #000;
  padding: 0.5em 1em;
  text-decoration: none;
}

/* Change the link color on hover */
.content nav li a:hover {
  background-color: #555;
  color: white;
}

.content article {
  background-color: #fff;
  color: #000;
  padding: 1.25em;
}

.colophon {
  display: block;
  background-color: #2e2e2e;
  width: 100%;
  height: 3.125em;
  padding: 0;
  margin: 0 auto;
}

.colophon p {
  color: #fff;
  text-align: center;
  line-height: 3.125em;
}

/* Approximately the size of an iPad Pro 12.9in ~ 1024px/64em */
@supports (grid-area: auto) {
  @media screen and (min-width: 64em) {
    .site {
      display: grid;
      grid-template-columns: 42em 1fr;
      grid-template-areas:
        "header header"
        "content aside"
        "footer footer";
      justify-content: center;
      width: 64em;
      margin: 0 auto;
    }
    
    .header {
      grid-area: header;
    }
    
    .aside {
      grid-area: aside;
    }
    
    .content {
      grid-area: content;
      display: flex;
    }
    
    .colophon {
      grid-area: footer;
    }
    
  }
}
!

JS
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999px

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