Web-programming / style

#main {
background-color: #cccccc;
padding: 5px;
text-align: center;
width: 600px;
margin-right: auto;
margin-left: auto;
border: 1px solid black;
}

div#header {
padding: 5px;
background-color: #dddddd;
}

h1 {
font-family: arial, sans-serif;
text-weight: bold;
font-size: 24pt;
}

h2 {
font-family: arial, sans-serif;
color: red;
text-weight: bold;
font-size: 18pt;
}

img.floatRight {
float: right;
width: 200px;
}

p.clear {
clear: both;
}

div#footer {
padding: 10px;
text-align: left;
clear: right;
}