How to get rid of scrollbars on a page?

Question

How to get rid of scrollbars on a page?

I know the answer to this question will be simple, but I have a pretty simple HTML page with 3 divs - header, map_canvas and sidebar. I have CSS to put it all where I need to. But for some reason, I get scrollbars in the browser window, and I don't want them there, I just want the page to fit the height and width of the window. Any help is greatly appreciated.

My page consists of this HTML:

<!doctype html>
<html>
    <head>
        <title>CSS Exercise</title>
        <link rel="stylesheet" href="css/style.css" />
        <script src="js/script.js"></script>
    </head>
    <body onload="initialize()">
        <div class="header"></div>
        <div id="map_canvas"></div>
        <div class="sidebar">
            <input id="lat" type="text" />
            <input id="lng" type="text" />
        </div>
    </body>
</html>

And this CSS:

body {
    height: 100%;
    width: 100%;
}

html {
    height: 100%;
}

.header {
    width: 100%;
}

#logo {
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 8px;
}

.sidebar {
    float: right;
    width: 20%;
    height: 100%;
    text-align: center;
}

#map_canvas {
   float: left;
   width: 80%;
   height: 100%;
}