Theme Installation Is Asking For Directory(Base Directory) Permission

I have php and laravel framework theme I bought from internet.When I try to install its asking for "Base Directory"Permission .I don't know wich dirctory is actually asking for? .And I had been try these kind of commands from stackoverflow .Also its docker container image with "Alpine Linux,PHP,Nginx" I can change myself I just don't know which directory it is? Screenshot of Issue

chmod 775 $(find /var/www/html -type f)
chmod 775 -R /var/www/html
chmod -R a+rX *

via Chebli Mohamed