body {
font-family: sans-serif; background-color: #000000; color: #FFFFFF; padding: 0
}
.header {
height: 100px; padding: 1em; position: fixed; top: 0; left: 0; width: 100%; margin-bottom: 1px solid #FFFFFF;
}
.content {
margin-left: 4em; margin-right: 4em;
}