How to add css to project on less?

Question

css

There is a project written in less.
There is one .css file.
Required: include the pure css file in the compilation of the single output file.
So far I've only googled it
@import "jquery.mCustomScrollbar.css"
, but it doesn't read the .css file into the compilation. Only the import of this file gets into the compilation, and it is included separately.
I know for sure that this can be done with sass, but about less...

Answer 1

For example, you can rename css to less and connect it as less partial, which it includes in the final file. And, as far as I understand, css code is valid code on less

Answer 2

@import (less) "style.css";