<pre><code style="color: #000000">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
    &lt;link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css" integrity="sha512-NmLkDIU1C/C88wi324HBc+S2kLhi08PN5GDeUVVVC/BVt/9Izdsc9SVeVfA1UZbY3sHUlDSyRXhCzHfr6hmPPw==" crossorigin="anonymous" referrerpolicy="no-referrer" /&gt;
    &lt;link rel="stylesheet" href="css/style.css"&gt;
    &lt;title&gt;2 section flexbox layout&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;div class="wrapper"&gt;
        &lt;header class="header"&gt;Header: Fixed height&lt;/header&gt;
        &lt;section class="content"&gt;
            &lt;div class="columns"&gt;
                &lt;main class="main"&gt;Content: Flexible width&lt;/main&gt;
                &lt;aside class="sidebar-first"&gt;Sidebar: Fixed width&lt;/aside&gt;
                &lt;aside class="sidebar-second"&gt;Sidebar: Fixed width&lt;/aside&gt;
            &lt;/div&gt;          
        &lt;/section&gt;
        &lt;footer class="footer"&gt;Footer: Fixed height&lt;/footer&gt;
    &lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>