In IE9, the margin: auto property does not effectively center a div element

I'm trying to center a content div in the space leftover by a sidebar. Here's how I want it to look:

After some trial and error, I was able to achieve this for most browsers by using margin: auto on the specific div, along with setting overflow: hidden:

View the Fiddle here

CSS

#header {
    height: 50px;
    background: #224444;
    color: #fff;
}

#container div {
    padding: 1em;
}

#content {
    max-width: 400px;
    margin: auto;
    background: #ddd;
    height: 300px;
    overflow: hidden;
}

#sidebar {
    float: right;
    width: 200px;
    background: #aaa;
    height: 300px;
}

HTML

<div id="container">
    <div id="header">
        PAGE HEADER
    </div>
    <div id="sidebar">
        Sidebar
    </div>
    <div id="content">
       Centered Content
        (Works everywhere but on IE9)
    </div>
</div>

Unfortunately, this solution doesn't seem to work with IE9, even though it works fine on IE8.

I'm at a loss for ideas, so if anyone has any insights into what might be causing the issue, please let me know. The workaround seems almost perfect except for IE9.

NOTE: It's important that the content div remains flexible as shown in the demo. It should adjust its size to fit the available space as it decreases.

Answer №1

Separate Floating Elements for Proper Alignment

This issue specifically impacts compatibility with IE9 and IE10.

The problem arises when using floating elements alongside the CSS property margin:auto in conjunction with max-width. This seems to confuse IE9 and above browsers. Removing the floated element or replacing max-width with width resolves this issue.

To resolve this issue, create a separate wrapper div for centering content, thereby separating the alignment of the content from the floating sidebar. Essentially, there is too much complexity within the single #content div for IE9+ to handle effectively. Hence, splitting the #content div into two distinct divs is recommended.

#header {
    height: 50px;
    padding: 1em;
    background: #224444;
    color: #fff;
}

#content-wrapper {
    overflow: hidden;
}
#content {
    max-width: 400px;
    margin: auto;
    padding: 1em;
    background: #ddd;
    height: 300px;
}

#sidebar {
    float: right;
    width: 200px;
    padding: 1em;
    background: #aaa;
    height: 300px;
}
<div id="container">
    <div id="header">
        PAGE HEADER
    </div>
    <div id="sidebar">
        Sidebar
    </div>
    <div id="content-wrapper">
        <div id="content">
            Centered Content
        </div>
    </div>
</div>

This solution was successfully tested across IE7, IE8, IE9, and IE10. As a point worth mentioning, due to the addition of the wrapper div, individual elements now require the padding: 1em; declaration.

Answer №2

Internet Explorer is known for having issues when proper doctypes are not included.

Consider including the HTML5 doctype:

<!DOCTYPE html>

Answer №3

Dealing with floats can be quite tricky. Technically, they are only meant to impact the inline content that surrounds them, causing margins to behave as if the floats aren't there.

Instead of using floats, consider the following approach:

#container {text-align:center}
#content {display:inline-block;text-align:left}

By implementing this solution, the content box will behave like an inline element and appear centered within the designated space.

Answer №4

From what I can recall, I've always encountered issues with using margin:0 auto because I forgot to specify the width property. So whenever you intend to use margin:auto, you should probably include this:

#content {
    max-width: 400px;
    margin: auto;
    background: #ddd;
    height: 300px;
    overflow: hidden;
    width:500px;
}

or in percentage:

#content {
    max-width: 400px;
    margin: auto;
    background: #ddd;
    height: 300px;
    overflow: hidden;
    width:30%;
}

MODIFY For a more flexible layout, consider exploring bootstrap and fluid grids.

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