5 div { height:
90px; margin:
0; padding:
0; border:none; }
6 .container { width:
400px; }
7 .middle { display:inline-block; width:
400px; background-color:green; }
11 <p> There should be a single green rectangle below.
</p>
12 <div class=
"container"><div class=
"middle"></div></div>