where you see the id #tabs in the style sheet just set a width there is pixels that works for you.

Then put margin: auto;

That will make it look a bit better. because I wouldnt change the...

If you look in the css you may find that there is a width set for this grey bar. You just need to change that so it fits round that buttons you have left. It will probably look like this:
...

If you are refering to jbennet's example site. That (i think) is just normal html text. So the button is actually set as a background image with text over the top of it. This effects the load...

Like Kaung said earlier on the best way of practising css is through trial and error. And like most computer related things there are tones of tutorials online. i think you will get a much bigger...