style.css

#container{
    font-family:Calibri, Helvetica, serif;
    color:#444;
    width:200px;
    margin:100px auto 0;
    padding:30px;
    border:1px solid #ddd;
    background:#f6f6f6;
    -webkit-border-radius:4px;
       -moz-border-radius:4px;
            border-radius:4px;
}

h1, nav{
    text-align:center;
    margin:0 0 20px;
}