Can't able to full screen my blog on desktop & mobile both


I download this template (bcoz of new user I cant post links) Search for YourMag template. I want to make my blog full screen with other contents. I tried to change max width to 100% it worked but only for desktop when I check my site on mobile its still not full screened. And when I max width my post-wrapper it only changes position and its width still remain same. My blog = enterkabaap.blogspot .in