Remove image outline

Hi,

I’m using the Customizr theme and minimax plugin to design my static homepage and I’m having a couple of problems:

1. I wish to make the content on the home page full width but I cannot seem to make this happen.

2. There is a grey outline around each of the images I upload – I would like to remove this so there is no padding, no border and no margin between the images. I believe the ‘outline’ is the line drawn around these elements (padding, border, margin) – https://www.w3schools.com/css/css_outline.asp

I’d really appreciate any and all help