a {
    text-decoration: none;
}

div {
    width:400px;
    margin-left: auto;
    margin-right: auto;
}

div#output {
    margin-bottom: 200px;
    text-align:center;
}

div#footer {
    text-align:center;
}

div#header {
    text-align:center;
}

div#input {
    text-align:center;
}