Bootstrap perhaps is the most popular frontend framework for developing mobile first projects on the web in recent years, its repository on github gets more than 100 thousands stars. Millions of websites are using it not only because it is easy to learn and use but the flexibility of customization.
In this book, we’ll focus on the customization part - build your own Bootstrap theme. At the time of writing this book, Bootstrap 4 is still in its alpha version, by “Bootstrap” here we are referring to Bootstrap 3. We will start with preparing a development workbench, and introducing Less (a CSS pre-processor Bootstrap uses), then walk through Bootstrap’s source code which will help us first get familiar with its code structure and later build themes by reusing it. Moreover, we will learn how to make additional styles and use plugins to polish our themes. Lastly we will touch on Bootstrap 4 a little and see how to use and customize it.