What is the best way to cope up with Customised Pattern Library for coding HTML/CSS?

I have got a project for developing HTML/CSS from PSD's but the client has additionally provided me with a link which refers to be a customized patter library(something like bootstrap).

I have no idea how to enable it to put that features in my code like the button which has a JSX Representation and Rendering of the HTML code for the button is mentioned in the pattern library and the Grids are defined.

How can i really come up to code with inclusion with the components defined inside the patter library?