transparent post

Hello, I’ve been struggling for a while now searching on how to change the white color of the page (you can check it here: http://masseur.gangov.net/%D0%BD%D0%B0%D1%87%D0%B0%D0%BB%D0%BE/) in my WordPress website to be transparent, the theme, that I’m using is Fara by FlyFreeMedia.

I’ll take any advice. Thanks.