How Can I Make an Element Fill the Remaining Width of a Container Using CSS?

Filling the Remaining Container Width with CSS

In certain scenarios, it becomes necessary to allocate the remaining width within a container to a specific element. For instance, consider a header bar with three elements: an image on the left, a middle element, and an element on the right. The goal is to ensure that the "middle" element fills the remaining space between the image and the right element.

Achieving the Desired Layout

To achieve this desired layout, employ the versatility of calc() in your CSS. Implementing the following code exemplifies this approach:

HTML:

<code class="html"><div class="left">
  100 px wide!
</div>
<div class="right">
  Fills width!
</div></code>

CSS:

<code class="css">.left {
  display: inline-block;
  width: 100px;
  background: red;
  color: white;
}
.right {
  display: inline-block;
  width: calc(100% - 100px);
  background: blue;
  color: white;
}</code>

In this code:

• The .left and .right classes are assigned to the respective elements.
• display: inline-block; enables the elements to align horizontally while flowing around other content.
• width: sets the explicit width of the .left element as 100 pixels, leaving the remaining space for the .right element.
• calc(100% - 100px); dynamically calculates the width for the .right element by subtracting 100px (the width of .left) from 100% (the full width of the container). This value ensures that the .right element fills the remaining space.

By utilizing this technique, the .right element will automatically adjust its width to fill the available space, effectively achieving the desired layout.

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