What is the best way to position a sidebar alongside content using flexbox?

As a newcomer to web development, I recently attempted to use flexbox for the second time while working on the layout for my website. However, I encountered an issue with trying to float aside next to content. Despite my efforts, it seems to just disappear. (Please note that the colors are used for distinguishing different elements).

Feel free to take a look at my layout idea:

https://i.sstatic.net/uSmCO.png

*,
*::after,
*::before {
  box-sizing: border-box;
}

body {
  margin: 0;
}

header {
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 135em;
  height: 7em;
  background: rgb(68, 100, 155);
}

section {
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
  background: chocolate;
  max-width: 100em;
  height: 50em;
}

aside {
  display: block;
  background: chartreuse;
  float: right;
  max-width: 20em;
  height: 50em;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
  background: crimson;
  max-width: 135em;
  height: 22em;
}
<header></header>
<section></section>
<aside></aside>
<footer></footer>

Answer №1

To achieve the desired layout, enclose your code within a div element and apply the CSS property display: flex; as shown below:

<header></header>
<div class="flex-container">
  <section></section>
  <aside></aside>
</div>
<footer></footer>

Incorporate the following styling in your CSS file:

.flex-container {
  display: flex;
}

.flex-container section {
  flex: 1; // Based on your design, this ensures that the element stretches accordingly
}

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