html {
    background-color: #663;
    color: #66A;
    display: block;
}

h1, h3, p {
    text-align: center;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

tr {
    background-color: #3D3;
}

.center {
    margin-left: auto;
    margin-right: auto;
}

.links {
    text-align: center;
}

a {
    display: block;
}