Save Time Referencing Bootstrap 4 Classes and Component Code Snippets.This Bootstrap reference guide book will help you find the code necessary to build common components, see a list of all the CSS classes, and get the color values in RGB and Hexadecimal format.Updated Supports Bootstrap 4.2.1 and Bootstrap 3.3.7This Bootstrap Reference Book Includes: Introduction to Bootstrap and responsive web design Bootstrap 4 Classes and Components Reference Bootstrap 4 Flexbox Utility Classes Reference Bootstrap 4 Colors Reference Bootstrap 3 Classes and Components Reference CSS Reference Responsive Images Reference Additional Frontend Development Reference and Resource Links Can&39;t this information be found for book on the documentation website? You can find most of the information contained in this book on the internet.