Libraries? Do you mean Sass and Compass? You don't need them to make the exact same effect, but it's just smart to do so because it will take you a lot less time and headaches. Besides, you just serve a compiled version so you're basically retaining the ability to create and define multiline buttons in CSS3 while retaining the ability to edit your source quickly and easily in Sass/Compass. And yeah I'd also make an image version for the browsers that don't support it CSS3. The benefits in loading time, bandwidth, and fewer http requests are worth it.