Edit History

@arsse

First of all according to the child theme architecture if you  call a file with same name it will load from your child theme. the classic theme has a file called theme_rtl.css  

that is why it load from child theme and all rtl related css is gone. I have tested and here is the final solution

1. remove theme_rtl.css from child theme

2.  create a file  1.7.7.5\themes\chaild\assets\css\custom_rtl.css and put all modification then it will looks like this

Do not forget to mark the post as solve and click the love icon to the answer

Thank you

chaild.zip