client/securedrop_client/resources/css/source_menu.css

QMenu {
    font-family: 'Source Sans Pro';
    padding: 0.5em 0 0.5em;
    font-size: 16px;
}

QMenu::separator {
    margin: 0.75em 1.75em 0.5em 1.675em;
    height: 1em;
    font-weight: 900;
    color: #b8c0de;
}

QMenu::item {
    padding: 0.5em 2em;
}

QMenu::item:selected {
    background: darkblue;
    color: white;
}