Compiling the Bootstrap Sass files using Gulp
When adding Bootstrap 4, you'll notice that the bootstrap folder contains a subfolder called dist. Inside the dist folder, there are ready-to-use Bootstrap CSS and JavaScript files that you can use as-is if you do not want to change any of the default Bootstrap colours or properties.
However, because the source Sass files were also added, this gives you extra flexibility in customizing the look and feel of your web application. For instance, the default colour of the base Bootstrap distribution is gray; if you want to change all the default colours to shades of blue, it would be tedious work to find and replace all references to the colours in the CSS file.
For example, if you open the _variables.scss ...
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