From:

		div#main {
			background: url("./background.png") no-repeat;
			background-color: #fff;
			margin: 0 auto;
			width: 1000px;
		}

-------------------------------------
Change to

		div#main {
			background: url("./background.png") no-repeat;
			background-color: #fff;
			margin: 30px auto 0 auto;
			width: 1000px;
		}