/* Black titlebar, square corners, ultra-thin */
headerbar {
    background: #000;
    border-radius: 0;
    border-bottom: 1px solid #555;
    box-shadow: none;
    min-height: 10px;
    padding: 0 2px;
    color: #fff;
    font-weight: bold;
}

headerbar:backdrop {
    background: #000;
    border-bottom: 1px solid #333;
    color: #999;
}

headerbar button {
    background: transparent;
    color: #fff;
    border: none;
    min-height: 14px;
    min-width: 14px;
    padding: 0 2px;
    margin: 0;
    box-shadow: none;
}

headerbar button:hover {
    background: #222;
}

headerbar:backdrop button {
    color: #999;
}

window, window.background {
    border-radius: 0;
}

.titlebar, decoration {
    border-radius: 0;
}