Added examples of using gradient backgrounds on buttons

[Avaray]

I’m not sure if <style> will be processed correctly in the documentation page. If you think this button example is unnecessary, feel free to reject the PR.

The buttons will look like this: https://play.tailwindcss.com/C7EgefbQww

[saadeghi]

I wish there was a way to define keyframes using utility classes… so people could just copy the HTML, without needing to add style to CSS file.

[Avaray]

Yep, there’s currently no way to do that with Tailwind CSS.