[html] Align contents inside a div

You can do it like this also:

HTML

<body>
    <div id="wrapper_1">
        <div id="container_1"></div>
    </div>
</body>

CSS

body { width: 100%; margin: 0; padding: 0; overflow: hidden; }

#wrapper_1 { clear: left; float: left; position: relative; left: 50%; }

#container_1 { display: block; float: left; position: relative; right: 50%; }

As Artem Russakovskii mentioned also, read the original article by Mattew James Taylor for full description.