body, html{
 margin: 0;
 background: #fff;
}

h1{
 font-size: 4em;
 text-align: center;
 font-family: sans-serif;
 vertical-align: middle;
}

p{
 font-size: 2em;
 font-family: serif;
 color: green;
 text-align: center;
 vertical-align: middle;
}

#only_section{
 vertical-align: middle;
}
