Take out whitespace about post

To remove some of the whitespace above your post try changing your margin-bottom to 0px so it looks like this:

.navigation {
	display: block;
	text-align: center;
	margin-top: 10px;
	margin-bottom: 0px;
	}

To centre your blog, go to the second reference to your #page under /*Begin Structure*/ and change the margin to the following:

#page {
	background-color: white;
        margin: 0px auto;
	padding: 0;
	width: 760px;
	border: 1px solid #959596;
	}