In Drift best practices have been followed for SCSS coding.
Drift is utilizing the BootStrap 4 as much as possible. Which means, you can make use of BootStrap classes directly most of the time rather than putting yourself in a learning mode to learn about each and every unique class.
This sets Drift apart from other competitors and gives an ease to developers in getting into
Another fact is, Drift is following the BEM (Block Element Modifier) methodology to speed up the development process and ease the teamwork of developers.