Well, I cannot increase the contrast much more, because it would be black/white then...
Why should it? The brightest part of your design is the text with a brightness of 119/255. Try to increase the brightness of the NerdsinSpaceWebsite.png image file a little and increase the contrast. I doubt that you will ever go back.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual