Take a look at the skin.css. It probably contains:

 

BODY
{
padding-right: 0px;
padding-left: 0px;
padding-bottom: 0px;
margin: 0px;
padding-top: 0px;
background-color: white;
font-family: Tahoma, Arial, Helvetica;
font-size: 12px;
font-weight: normal;
text-align: center;
}

Change that to left or delete it.