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;

}