body {
    padding: 20px;
}

#output {
    margin-top: 20px;
    font-size: 1.2em;
    color: green;
}

#error {
    margin-top: 20px;
    font-size: 1.2em;
    color: red;
}

.highlight {
    border: 2px solid blue;
}

.modal-backdrop {
    display: none;
}