body {
    margin: 50px 50px 50px 50px;
    color: #000000;
    background-color: #ffffff;
}
a, :visited {
    color: #990000;
    background-color: #ffffff;
    text-decoration: none;
}
h1 {
    text-align: center;
    color: #000077;
    background-color: #ffffff;
    font-size: xx-large;
}
h2, h3, h4 {
    color: #000077;
    background-color: #ffffff;
}
img {
    border: 0;
}
p {
    text-align: justify;
    margin: 20px 20px 20px 20px;
}
pre {
    color: #4444cc;
    margin: 20px 20px 20px 40px;
}
code {
    color: #4444cc;
}
.copyleft {
    text-align: center;
    font-size: small;
}
.heading {
    width: 100%;
}
.side {
    width: 138px;
    text-align: center;
}
.middle {
    text-align: center;
}
h3 {
    text-align: center;
}

.buttons {
    vertical-align: middle;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}
table {
    margin-left: auto;
    margin-right: auto;
}
td {
    padding: 5px 5px 5px 5px;
}