html,
body {
    margin: 0;
    min-height: 100%;
    background: #111827;
    color: #f9fafb;
    font-family: Arial, sans-serif;
}

body {
    padding: 16px;
}

.hidden {
    display: none !important;
}

select,
button {
    border: 0;
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 700;
}

select {
    width: 100%;
    margin-bottom: 16px;
}

button {
    cursor: pointer;
}