Luckily enough, Bootstrap 3.3.7--the latest stable release at the time of writing--is already installed in our project, thanks to the ASP.NET Core MVC with Angular template we chose to use back in Chapter 1, Getting Ready. Whoever knows how it looks can easily understand how it couldn't be otherwise, since its classes are being used anywhere in our Angular HTML templates!
For those who'll ask why we didn't use Bootstrap 4 here, at the time of writing, the v4 is still in alpha (4.0.0.alpha6) and is still subject to a relevant amount of breaking API changes. Although there are a lot of early adopters willing to use it these days, there's no way we can adopt it within this book. The reader is encouraged to try it out as soon as he'll think it's time, as long as he won't forget the disclaimers we wrote back in Chapter 1, Getting Ready.