Custom CSS styling

[playcoolly]

Hello, or should I say, Bonjourr.

I want to customise the page. I want custom CSS but I forgot CSS, so I need you guys to help me out if you can do the CSS for me.
These are the things I want:

1. Clock's time in bold font (not the date also please)
2. Extensions to pop up lesser on hovering.

Please help if possible.