<!DOCTYPE html>
<html>
<head>
    <title>CSS Reference File</title>
    <link rel="author" title="Rebecca Hauck" href="mailto:rhauck@adobe.com"/>
    <style type="text/css">
        body {
            margin: 0;
        }
        .green {
            top: 70px;
            left: 10px;
            width: 100px;
            height: 100px;
            background-color: rgb(0,100,0);
        }
        .blue {
            top: 50px;
            left: 60px;
            width: 2px;
            height: 140px;
     