Too Big Category rows!

I have a problem vith apearance of my forum. I was editing font and background colors in css (firebug) when suddenly i refreshed my page and all the rows were to big . You can see it here http://your.techno-zone.net/

Please help me , what should I do ?

btw Im using invision

Go to the CSS...

Find:

Code:

p {
display: block;
margin: 1em 0px;
}

Remove the 1em.