Background image for header

I would like to set a background image for the normal and the sticky header (theme Stockholm). I tried to realize this with following CSS snippet:

background-image: url(http://…)

I also put it in the stylesheet for the different „fusion-header“ classes, but it didn’t work.

Furthermore, i also tried to achieve to move the logo, that it reaches a bit into the content. It’s supposed to look like, like on this website:
Unfortunately, i didn’t find something for this in the theme options.

(URl to the site i am working at:

Thank you for your time and i hope you can help me out.

How did you manage it in the end?