The child element extends beyond the boundaries of its parent container in HTML

Have you ever encountered a situation where the inner div element is wider than the outer div? It can be a bit frustrating, but there are ways to address this issue.

So, what causes this to happen in the first place? And more importantly, how can we ensure that the inner div stays within the boundaries of the outer div?

<div id="outer">
  <div id="inner"></div>
</div>

Answer №1

Based on a comment, the inner element's width exceeding the parent's is due to margin and padding settings.

(width + padding + margin + border) of child > parent width

Here's an example

Possible Solutions :

  • For margin : Calculate
    (width + margin) of child =< parent width
    See demo
  • For border and padding : Utilize the box-sizing property to incorporate padding and border in the element's width View demo (or use a similar approach as margin)
  • For border, margin and padding : If you don't need to specify a width for the inner element, omit it and the default behavior for block elements will include margin, padding, and border within the parent Check out demo

Answer №2

<div id="container">
  <div id="content">Content Inside</div>
</div>
<style type="text/css">
  #content,  #container {
    box-sizing: border-box;
    width: 100%;
    border: solid 1px #000;
    padding: 1%;
  }
</style>

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