stys-for-overleaf
Missing
.sty/.clsfiles for overleaf.
Overleaf is based on TeX Live 2021 as of end of October 2021. New packages after that update are not offered automatically. As a result, recent packages available on CTAN (and thus in TeX Live and MiKTeX) are not available as default.
They have a FAQ What packages do you support?, which asks the users to upload sty files for themselves (to keep their system consistent and stable).
Thus, users have to upload missing sty files manually.
However, not all package authors offer the compiled sty file, but only the source files of that sty files.
Although all texlive packages are available online, they are archived and one cannot directly download the sty files.
Hence, this repository offers quick access to required cls/sty files.