Display more NG albums horizontal

This might be a matter of my Theme or WordPress itself, but as simple as it is I could not find any answers.
I succeeded in making four albums for my frontage, but the albums (in compact display mode) will only show up vertical.
To make a smooth looking frontage I need to align the four albums horizontal in one or two rows.
How?

http://wordpress.org/extend/plugins/nextgen-gallery/