Ci sono degli errori nel CSS:

Errors
URI : http://www.lbweb.it/style.css
Line: 21 Context : .buttons

Parse Error - ;" }
Line: 213 Context : .post img

Property align doesn't exist : center
Line: 292 Context : #sidebar ul

Property font-color doesn't exist : #336699
Line: 300 Context : #sidebar li

Invalid number : text-align normal is not a text-align value : normal
Line: 303 Context : #sidebar p

Invalid number : font Parse Error - size:95%
Line: 348 Context : .profile-link

Invalid number : font Trebuchet is not a font-size value : Trebuchet MS,Verdana,Helvetica,sans-serif
Line: 358 Context : #footer

Invalid number : float bottom is not a float value : bottom
Line: 394

Parse Error - :100%; } .mytable