Big changes in version 4
Let's continue by going over the biggest changes to the Bootstrap framework in version 4.
Switching to Sass
Perhaps the biggest change in Bootstrap 4 is the switch from Less to Sass. This will also likely be the biggest migration job you will need to take care of. The good news is you can use the sample code we've created in the book as a starting place. Luckily, the syntax for the two CSS pre-processors is not that different. If you haven't used Sass before, there isn't a huge learning curve that you need to worry about. Let's cover some of the key things you'll need to know when updating your stylesheets for Sass.
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