Bootstrap

The most popular and easy to use set of css and javascript to make your apps look professional.

Intro to Bootstrap

If you haven’t yet, clone Cosi166b Public Samples repo and cd to public_samples/htmletc/bootstrap_demo
Bootstrap is an open source front-end framework
History: It came from Twitter, and used to be called “Twitter Bootstrap” but now it is its own open source project, and is called just “Bootstrap”
It consists solely of css, javascript, some images, and some fonts
You should use release 5 even though it’s barely out of beta
There are various Gems to use Bootstrap with Rails