body{
font-family:Arial;
margin:0;
background:#fafafa;
}

header{
background:#111;
color:#fff;
padding:15px;
}

nav a{
color:#fff;
margin-right:10px;
text-decoration:none;
}

article{
background:#fff;
margin:20px;
padding:20px;
border-radius:6px;
}