.wrap {
	width: 960px;
	margin: 0 auto;
	text-align: left;
	}

#posts {
    float: left;
    width: 660px;
	background: #f7f7f7;
	box-sizing:border-box;
	padding: 10px;
	}
#sidebar {
    float: right;
    width: 280px;
	}