How to remove blank space around header image and logo

Aigars, I am trying to add images or text content to the header on my website currently as you will see i only have my logo and a huge blank area. How can i fill said blank area with text and or image content? Thanks in advance!

Also, is there a way to change the opacity of the gray overlay while leaving the pictures/text that cover them at full opacity?

About background opacity/transparency. Since you are trying to change opacity for the entire #wrapper, the entire website becomes transparent.
Just to change background transparency you should change background-color for #wrapper from “#dadada” to “rgba(218,218,218,.78)”. It should do the trick.

Custom header images are coming soon for this theme. Most likely I will release it by the end of next week. Unfortunately, no easy fix at this point.