1#parent {
2  position: relative;
3  width: 400px;
4  height: 400px;
5  background: red;
6  border: 0 solid black;
7}
8#child {
9  position: absolute;
10  height: 100px;
11  top: 100px;
12  background: blue;
13  border: 0 solid black;
14}
15.floatLeft {
16  width: 50px;
17  height: 10px;
18  background: green;
19  float: left;
20}
21