The dynamic width of the content (pictures and text)

Hello everyone,

I hope You all had some nice holidays.

My Question: I like the style of the Page "websitex5.com" dynamic width of the content (pictures and text).
The text and pictures are on full width of the screen and are respond to the size of the screen.

I cant figure out how to make my pictures to the full with and a line on the left and right of my text.

I appreciate any help on my issue.
Best Regards,
David