A Base For Building Responsive Layouts: Responsive Boilerplate
There are many ready-to-use frameworks and kits for creating responsive websites.
For anyone who is in search of a simple and focused resource for such layouts, here is Responsive Boilerplate.
It is a lightweight (only 2kb) base that makes use of CSS3, for bringing responsive websites to life.
The boilerplate has a single container + a 12-column grid and supports any content with images, video or fluid media with major breakpoints.