body {
 font-family: 'Courier New', Courier, monospace;
 color: darkblue;
 background-color: rgba(183, 221, 15, 0.815);
}

.center {
    margin: auto;
    width: 50%;
    padding: 10px;
    text-align: center;
}

/*
Style for numbererd lists.
*/
div.list {
    counter-reset: list-number;
}

div.list div {
    counter-increment: list-number;
}

div.list div:before {
    content: counter(list-number)
}