I am trying to resize the header image to 788 by 404 px, because the default size won't admit my header image (which can be found here) without me having to severely distort it first. I've been on the 'Designing Headers' page but the example CSS there doesn't seem remotely compatible with Chunk's. I should point out at this point that I am very new to CSS and have only a vague knowledge of HTML (I'm sure you guys must dread people like me). Any help you could give me would be hugely appreciated.
The blog I need help with is ilkjournal.wordpress.com.