body {
    max-width: 800px;
    margin: 0px auto 0px auto;
    display: block;
}

hr {
    height: 3px;
    border-style: none;
}

hr.solid {
    background: black;
}

hr.dotted {
    color: white;
    background-color: white;
    border-bottom: 3px dashed gray;
}