Logo Resizing Zeal Theme CSS

Hell Team,

This is in regards to Zeal theme. how to resize logo. tried using css but not luck.
.site-logo { width: 200px; }

PS. I am in very early stage of website designing so can switch to some other theme too. Only thing i want is full width template and a separate navigation (not overlapping on main page image). So if you have any suggestion, pls advice. Reason for this I searched your support forum and noticed that you mentioned that zeal has some weird css going on.

Thanks