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.

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.

Also, the download package include a PSD grid, Sublime snippets and some JavaScript for responsive navigations.

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