body {
    margin: 0;
    font-size: 1rem;
}

header.page_toolbar {
    font-family: Arial, sans-serif;
    background-color: #ccc;
    padding: 1rem;

    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}

header.page_toolbar select {
    font-size: 0.85rem;
    padding: 0.25rem;
}