Now - stealing is wrong. However, there are times when you really like how a certain blog laid out its type, or how a particular menu functions. In that event, I have a solution:
FIREFOX, IE or SAFARI (Chrome?)
If you're using a nice browser, you should be able to right-click and "view page source." At the top of the browser, you'll see something should look like this:
copy the URL inside the "" of the HREF part, and you've got the URL to that blog's stylesheet. Paste into your address bar and look for the snippet you wanted.
<link rel="stylesheet" href="thecssfile.css" />
Incidentally, more "design friendly" websites will have multiple stylesheets. Make sure you find the one you want. This is a great way to see how CSS works in a browser, and learn how to do things yourself.
However, NEVER steal the exact design of another website. EVER. It's totally wrong so don't do it okay?
But do take a peak at the stylesheet. The owner won't care.