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Editorial Team
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Asked: 2026-05-26T08:04:44+00:00

Why doesn’t this EXTREMELY simple webpage show the div with the id mainContent in

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Why doesn’t this EXTREMELY simple webpage show the div with the id “mainContent” in the centre of the page.

Right now the div is on the left. But I would like the div to be centred in the webpage(body element).

Whats going wrong?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> </title>

    <style type="text/css">
    <!--
        body {
            text-align: center;
            background-color: red;
        }

        #mainContent {
            width: 800px;
            background-color: blue;
        }

        #content {
            width: 600px;
            float: left;
            background-color: green;

            overflow: hidden;
        }

        #sidebar {
            width: 200px;
            float: left;
            background-color: yellow;

            overflow: hidden;
        }
    -->
    </style>
</head>
<body>

    <div id="mainContent">
        <!-- Left Column/Bar -->
        <div id="content">
            <p>content</p>
        </div>

        <!-- Right Column/Bar -->
        <div id="sidebar">
            <p>sidebar</p>
        </div>
    </div>

</body>
</html>
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1 Answer

  1. Editorial Team

    You just need to add margin: 0 auto; which gives it 0 margin on top and bottom, and automatic margins left and right.

        #mainContent {
        width: 800px;
        margin: 0 auto;
        background-color: blue;
    }
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