CodeIgniter uses Dart Sass to generate the debug toolbar's CSS. Therefore, you will need to install it first. You can find further instructions on the official website: https://sass-lang.com/install
Open your terminal, and navigate to CodeIgniter's root folder. To generate the CSS file, use the following command:
sass --no-source-map admin/css/debug-toolbar/toolbar.scss system/Debug/Toolbar/Views/toolbar.css
Details:
--no-source-map
is an option which prevents sourcemap files from being generatedadmin/css/debug-toolbar/toolbar.scss
is the SASS sourcesystem/Debug/Toolbar/Views/toolbar.css
is he CSS destination