body {
    background-color: darkorange;
    font-family: monospace;
    font-size: 250%;
}

div.center {
    display: block;
    margin: auto;
    width: 50%;
}

p.center, img.center, ul.center {
      display: block;
      margin-left: auto;
      margin-right: auto;
      width: 50%;
}