margin 0px auto not working


I have an mvc layout using css.  It uses a margin 0px auto and is not centering


layout ------------------

<!DOCTYPE html>

    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Reliability Info</title>

Want this centered as well as all content

        <div class="topHeader">
                <img src="~/Content/images/ReliabilityInfo.png" />

    <section class="bannerAd">


        <article class="article"></article>        

        <aside class="sideTowerTop"></aside>
        <aside class="sideTowerMiddle"></aside>
        <aside class="sideTowerBottom"></aside>

    <div id="main">

         <p>&copy; @DateTime.Now.Year - Reliability Info</p>



index.cshtml  -- not much

    ViewBag.Title = "Home Page";

-------------------------------------- css

body {
    padding-top: 0px;
    padding-bottom: 0px;
    margin: 0px auto;


.topHeader {

    display: block;
    margin: 0px auto;
    background-color: maroon;
Charles BaldoSoftware DeveloperAsked:
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Dave BaldwinFixer of ProblemsCommented:
Since 'body' is everything that the browser displays, setting the margins to 'auto' there has little effect.  You almost always have to have a container div inside the body with the margins you want.  Frequently it is called 'wrapper' because it 'wraps' all of the visible content into a single containing 'div'.  It also must have a defined width for 'auto' to work.

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Charles BaldoSoftware DeveloperAuthor Commented:
Excellent thanks
Dave BaldwinFixer of ProblemsCommented:
You're welcome, glad to help.
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