How to do it...

1. Stop the running Jekyll server by clicking inside the Bash console tab and using Ctrl + C.
2. Navigate to the scss folder and open the _variables.scss file:

      cd && cd workspace/scss && c9 _variables.scss

1. Find the Sass variable $enable-rounded, and uncomment the line it is on, so that it looks like this:

      // $enable-rounded: true !default;

1. On the very next line, paste in the following code:

      $enable-rounded: false !default;

1. Still in console, change directory into the scss folder by running cd scss command. Then, run the following command:

      sass bootstrap.scss ../dist/css/bootstrap.css

This command will recompile SCSS into CSS for Bootstrap docs.

1. Go back out from the scss folder, by running cd ... Back in the console tab, run the following command:

      bundle exec jekyll serve --watch --host $IP --port $PORT --  
      baseurl ''

When you refresh the webpage, it will now show the homepage with the Download Bootstrap button with sharp edges, instead of rounded ones, as seen in the following screenshot:

1. Back in the _variables.scss file, override the default values by adding more changes:

      $white: #ddd;
      $enable-rounded: false;
      $spacer: 8rem;
      $font-size-base: 2rem;

You should probably make use of your code editor's search and replace function to complete this step. Once you have completed the step, make sure that you save the file.

1. Recompile SCSS again by pointing your console to the scss folder with cd scss, then running the command from step 6 once again:

      sass bootstrap.scss ../dist/css/bootstrap.css

1. Rebuild Jekyll by running:

      bundle exec jekyll build; 

1. Go into _gh_pages and run Jekyll server:
   

      jekyll serve --watch --host $IP --port $PORT --baseurl '' 

This should result in the following changes on the docs website: