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/usr/share/themes/Blackbird/gtk-3.0/apps/unity.css is in blackbird-gtk-theme 0.4+20160704~ab4a30e-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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UnityPanelWidget,
.unity-panel {
    border-width: 0 0 1px 0;
    border-style: solid;
    border-color: shade(@panel_bg_color, 0.8);
    background-image: -gtk-gradient(linear, left top, left bottom,
                                     from (shade(@panel_bg_color, 1.1)),
                                     to (shade(@panel_bg_color, 0.9)));

    color: @panel_fg_color;
}

.unity-panel.menubar,
.unity-panel .menubar {
}

.unity-panel.menuitem,
.unity-panel .menuitem {
    border-width: 0 1px;
    color: @panel_fg_color;
}

.unity-panel.menubar.menuitem:hover,
.unity-panel.menubar .menuitem *:hover {
    border-color: shade(@panel_bg_color, 0.7);
    background-image: -gtk-gradient(linear, left top, left bottom,
                                     from (shade(@panel_bg_color, 0.97)),
                                     to (shade(@panel_bg_color, 0.82)));

    color: @panel_fg_color;
}