margin 0px auto not working

Hi

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

site:  charlesbaldo.com

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

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Reliability Info</title>
    @Styles.Render("~/Content/Site.css")
</head>

<body>
Want this centered as well as all content

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


    <section class="bannerAd">
    </section>

    <nav>
    </nav>

    <section>
        <header></header>
        <article class="article"></article>        
    </section>

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

    <div id="main">
        @RenderBody()
    </div>

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


</body>
</html>

-------------------------------------------

index.cshtml  -- not much

@{
    ViewBag.Title = "Home Page";
}

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

body {
    padding-top: 0px;
    padding-bottom: 0px;
    background-color:#808080;
    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
0
Dave BaldwinFixer of ProblemsCommented:
You're welcome, glad to help.
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