If there is some extra space above your logo that you want to get rid of, you'll need to do the following:
- Log in to you CoreCommerce admin
- Hover over the Design tab and click on Advanced Options
- Open up main.css
- Look for #logo
- Look for the margin. It will look like this: margin: 30px 0 0 0; (numbers are for top - right - bottom - left)
- Change the top (in this example, 30px) to 0, so it looks like 'margin: 0 0 0 0;' Or better yet, set it to 'margin: 0;'.
- Save and you're done!
For additional help with learning HTML and CSS, this site is a great resource: http://www.w3schools.com/