How to Make a Nested DIV Container Expand to Accommodate its Children?

Height Expansion in Nested DIVs for Page Content Accommodation

When working with nested DIV structures, it is common to encounter the challenge of ensuring that the main container resizes dynamically to accommodate its child DIVs. In this specific scenario, the goal is to have the #main_content DIV expand its height as needed to house the items within it.

To address this issue, one effective solution is to force a clearfix before closing the #main_content DIV. This calls for moving the
tag into this DIV.

<code class="css">.clear {
  clear: both;
}</code>

Modern Approach with Flexbox

For a more contemporary solution, consider employing Flexbox, a newer layout method in CSS3. This technique allows for flexible box layouts, where elements are arranged in a column or row with customizable sizes and automatic resizing.

To implement Flexbox, define the parent container as a flex container and set its flex direction to columnar. This ensures that the child elements stack vertically. Then, assign the flex property to the primary content section to indicate that it should expand to occupy available space.

<code class="css">body {
  margin: 0;
}

.flex-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: #3F51B5;
  color: #fff;
}

section.content {
  flex: 1;
}

footer {
  background-color: #FFC107;
  color: #333;
}</code>

<code class="html"><div class="flex-container">
  <header>
    <h1>
     Header   
    </h1>
  </header>

  <section class="content">
    Content
  </section>

  <footer>
    <h4>
      Footer
    </h4>
  </footer>
</div></code>

By incorporating these techniques, you can effectively achieve the desired behavior where the #main_content DIV or its modern Flexbox equivalent dynamically resizes to encompass all child DIVs, providing a visually appealing and responsive design.

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