how to put logo in header html

1#Put this in Head
2.header img {
3  float: left;
4  width: 100px;
5  height: 100px;
6  background: #555;
7}
8
9.header h1 {
10  position: relative;
11  top: 18px;
12  left: 10px;
13}
14#Put this in body
15<div class="header">
16  <img src="debian.png" alt="logo" />
17  <h1>Debian</h1>
18</div>
19
20