Placing an image to the top right corner – CSS

You can just do it like this:

<style>
    #content {
        position: relative;
    }
    #content img {
        position: absolute;
        top: 0px;
        right: 0px;
    }
</style>

<div id="content">
    <img src="images/ribbon.png" class="ribbon" alt="" />
    <div>some text...</div>
</div>