Juice
Juice inlines CSS stylesheets into your HTML source
Given HTML, juice will inline your CSS properties into the style attribute. Juice has a number of functions based on whether you want to process a file, HTML string, or a cheerio document, and whether you want the juice to automatically get remote stylesheets, scripts, and image dataURIs to inline. To inline HTML without getting remote resources, using default options. Juice is exposed as a standard module, and from CLI with a smaller set of options.