Ensure that the form input field expands to occupy the full width of a div, excluding any space already taken up by other elements

My design includes a div element with a header, input field, and button aligned in a row at the center. I want the input field to expand dynamically, filling up the entire width available within the div. Is there a CSS technique that would allow me to specify a rule like width: 100%-other_elements?

Answer №1

Is there a way in CSS to make an element's width be 100% minus the width of other elements?

A solution is to utilize flexbox by adding the class "some-container" to the parent element and the class "expand" to the element that should take up the remaining space. This allows for dynamic and flexible layout adjustments. Check out the example below and experiment with resizing the window. For more comprehensive insights on flexbox, refer to the detailed tutorial provided by CSS Tricks.

Key points from the CSS breakdown:

  • display: flex on .some-container specifies that this element will use flexbox properties.
  • flex: 1 on .expand indicates that this element should expand within its parent container based on available space.

.some-container { display: flex; }

.expand { flex: 1; }
<div class="some-container">
  <h1>some header</h1>
  <input class="expand" type="text">
  <button>some button</button>
</div>

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