Content area side padding

Hi-
On this site
https://rickvv.com/ntwjazz/
I cannot quite figure out how to get the content in a text block area including images to go all the way to the edges of content (aligned under header?). Lots of white space. I thought it would be to change to aligned header container, but can’t get it to conform.
And to add space between images enclosed vertically in that text box
Can you help, please?
thanks
rickvv