body {
			width: 960px;
			margin: 2em auto;
			font-family: Arial, sans-serif;
			font-size: 16px;
			line-height: 1.4;
		}

		h1 {
			font-size: 2em;
			font-weight: normal;
			margin: 0 0 1rem 0;
		}
		section {
			padding: 2rem;
			border: 1px solid #ccc;
			margin: 4rem 0;
			background-color: #fff;
		}

		aside {
			font-size: 24px;
			font-family: Georgia, Serif;
			font-style: italic;
			background-color: #aaa;
			color: #fff;
			padding: 1.5rem;
			width: 15rem;
		}
		.block1{
			float:right;
		}
		.block2{
			position: absolute;
			margin-left:638px;
			margin-top:72px;
		}
		.block3{
			background-color: green;
			position: fixed;
			top:0;
			right: 0;
		}
		.block4{
			background-color:red;
			position: absolute;
			margin-left: 290px;
			z-index: 2;
		}
		.block5{
			background-color:black;
			position: absolute;
			margin-left:300px;
			margin-top:10px;
			z-index: 1;

		}