h1, h2, .display
{
    text-align:center;
}
.pybox
{
    margin-left:auto;
    margin-right:auto;
    width:75%;
    background-color:lightgreen;
    border: solid 1px black;
    padding:1em;
}
body
{
    margin:1em;
    background-color:#FFF8E7;
}