Deeper Header Area

Im a newbie to opencart, and only know basic website design, so be gentle with me!

I want to increase the area at the top of the site to fit in a higher header/banner image, is there an easy way to do this. Ive been looking at shrinking my current header to fit in the space, but its looking too small.

Any help is much approeciated!

PS Opencart seems a great package, ticks all the boxes for what I need from an ecommerce site, without too much modiifcation.

Edit the catalog/view/theme/default/stylesheet/stylesheet.css file. If you have created a new theme then substitute the default directory with you theme directory.

Alter
To whatever height you require.

Hi,

Thanks very much, Ive just about sorted my site now with that help. I just want to change the size of the search box since Ive moved the 'search' box to just below the 'information' box on the left lower section of the site.

Since the default search box is wider than the others it overlaps into the main central section. Therefore I want to make the box narrower but higher so that it can have the blank input box with the search button underneath (rather than at the side as default). What file(s) control the actual box format?

Thanks in advance