Reduce width further

I’m nearly there with this and very pleased with it. However, I can’t find a way to reduce the width as much as I would like. Looking at it on the iPhone, it’s slightly wider than the screen so looks messy. I’ve been able to adjust it, but can’t seem to take it below about 200px. I’ve tried editing in the code within the post or on the settings – neither method can shave of the extra pixels.

Many thanks in advance for your help.

See here.