Spacing between header and navigation bar

Hello wordpress community.
I’m using the mumrik theme.
I have an unwanted space between my header and my navigation bar. I don’t know where this is coming from. I have been looking through the css files and I’m not seeing where this extra space is..?
Here is my site and instantly you will notice what i’m referring to.
This must be a quick fix, but i’m still coming up to speed with css.
Some help would be much appreciated