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/usr/share/themes/BlackMATE/gtk-3.0/unity.css is in mate-themes 3.22.16-4ubuntu1.

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The actual contents of the file can be viewed below.

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/* Decorations */

UnityDecoration {
    -UnityDecoration-extents: 28px 1px 1px 1px;
    -UnityDecoration-input-extents: 10px;

    -UnityDecoration-shadow-offset-x: 1px;
    -UnityDecoration-shadow-offset-y: 1px;
    -UnityDecoration-active-shadow-color: rgba (0, 0, 0, 0.647);
    -UnityDecoration-active-shadow-radius: 15px;
    -UnityDecoration-inactive-shadow-color: rgba (0, 0, 0, 0.647);
    -UnityDecoration-inactive-shadow-radius: 10px;

    -UnityDecoration-glow-size: 10px;
    -UnityDecoration-glow-color: rgb (221, 72, 20);

    -UnityDecoration-title-indent: 10px;
    -UnityDecoration-title-fade: 35px;
    -UnityDecoration-title-alignment: 0.0;
}

UnityDecoration.top {
    border: 0px;
    border-bottom-width: 0;
    border-radius: 8px 8px 0 0;
    padding: 1px 8px 0 8px;

    background-color: transparent;
    background-clip: border-box;
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (#59595b),
                                     color-stop (0.5, #454547),
                                     to (#3b3b3e));

    color: @theme_text_color;
    text-shadow: none;
}

UnityDecoration.top:backdrop {
    border: 0px;
    border-bottom-width: 0;
    background-color: transparent;
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (#59595b),
                                     color-stop (0.5, #454547),
                                     to (#3b3b3e));
    color: #747473;
    text-shadow: none;
}

UnityDecoration.left,
UnityDecoration.right,
UnityDecoration.bottom,
UnityDecoration.left:backdrop,
UnityDecoration.right:backdrop,
UnityDecoration.bottom:backdrop {
    background-color: @theme_bg_color;
}

/* Panel Style */

UnityPanelWidget,
.unity-panel {
    background-color: transparent;
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (#585858),
                                     to (#000000));

    color: @theme_text_color;
}

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

.unity-panel.menuitem,
.unity-panel .menuitem {
    border-width: 1px 1px 0 1px;
    -gtk-icon-shadow: 0 -1px #000000;
}

.unity-panel.menubar:backdrop,
.unity-panel .menubar *:backdrop {
    color: #747473;
}

.unity-panel.menubar.menuitem:hover,
.unity-panel.menubar .menuitem *:hover {
	background-image: none;
	background-color: @theme_selected_bg_color;
	color: @theme_text_color;
}