CSS settings in the Ruby theme

I want to reduce the height of the top banner. The theme offers 3 possible heights, but I would like a 4th I rule myself.
I also wish to adjust the height of the ExtraContent Area 1
Is that possible with CSS code?
Thanks for your help.

#banner {
height: 100px;

will change the height of the banner area to 100px. Just substitute your own figure for this one. Be aware that it may affect the positioning of the slogan if you’re using one.

Not sure about EC1 I’m afraid.

Hello Robbeattie,
This is exactly what I wanted and it’s just limit for the slogan.
Thank you, it’s perfect !!
And sorry for my approximate English.