The most flexible way to edit the theme CSS or to add your own code and components to use SCSS. As mentioned before, there are two files already prepared for your changes -
To configure the theme, e.g. to change colours for some elements, to change font sizes, etc., use
_user-variables.scss. Any variable from
scss/modules/_variables.scss can be overridden here with your own value.
To add your own CSS code, declare it in the
To compile the SCSS, you can use the
gulpfile.js included in this theme (recommended) or you can download an app for your OS and compile it that way. In case you would be using an app, don’t forget to add vendor prefixes to your code too (done by Autoprefixer in the Gulp ).
If you prefer to work with Sell as a static source and not to use Gulp or Sass, you will need to add your custom CSS through a separate CSS file. For this use, there is a blank
custom.css file in the CSS folder.