How to add CSS file?

Created a new template by copying an existing template and modifying values in /scripts/BxTemplName.php file but would like to create one CSS file to add all changes instead of scattering them across multiple CSS files.

Assuming it can be done, what's the best way to add a CSS file to a template to be loaded after all other CSS files?

Thanks in advance

In the file _header.html inside your template's folder, add your CSS file manually after the line:

    <bx_include_css />