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In this article, I demonstrate how to modify Bootstrap 4 according to a design that has its own color theme, responsive breakpoints and spacing styles. Bootstrap is the most popular CSS framework and allows room for the different look and feel of millions of websites built on top of it. The author is new to front-end development and uses SCSS to customize Bootstrap based on the design he received. He also uses Sass to create a custom Sass/CSS file to override the default Bootstrap variables originally contained in the default.