html, body, dialog {
    background: #000;
    color: #fff;
    font-family: sans-serif;
    padding: 2px;
    text-align: center;
}

h1, h2, h3 {
}
a {
    color: #0af;
}

button, .btn, select {
    background: #333;
    border: 2px solid #444;
    border-radius: 3px;
    color: #fff;
    display: block;
    margin: 5px;
    min-width: 250px;
    padding: 5px;
    text-align: center;
    width: 60%;
}

button, select {
    margin: 5px auto
}

dialog {
    border: 2px solid #333;
    height: 200px;
    min-width: 250px;
    width: 50%;
}

dialog::backdrop {
    background: #000a
}

table {
    display: inline-block;
}

tr td {
    background: #202020;
    border: 1px solid #555;
    padding: 4px;
}

tr:nth-child(even) td {
    background: #2a2a2a;
}

.centered, .btn-div a {
    margin: 5px auto;
    text-align: center;
}

.q {
    background: #222;
    border: 2px solid #444;
    border-radius: 3px;
    font-family: monospace;
    font-style: italic;
    padding: 2px;
}

.sp {
    height: 200px;
}

.sp50 {
    height: 50px;
}

:disabled {
    filter: opacity(0.5);
}