In this last case I strongly advice Mozilla FireFox
Here you can find some links to my CSS examples. All the CSS needed to let these examples work is embedded into the single pages.
The following resizing, graphical, multiple-border box - done with plain valid CSS+HTML - will work ONLY in © Mozilla Firefox. Any other browsers should fail miserably.
By the way, be sure to check out Stu Nicholls' CSS-Play Website: it's a fantastic place to find resources, workarounds and browsers' quirks about CSS styling.