Maybe there's an easy answer, but I don't know it. I know you can float right, but is there anyway to position something at the bottom of a box?
You can use absolute positioning. Absolute positions relative to its first positioned ancestor. If there is none it defaults to the document. So I gave it a parent with relative
.
#parent { position: relative }
#foo { position: absolute; bottom: 0; right: 0; }
<div id="parent">
<div id="foo"></div>
</div>