artwork/usr/share/themes/Lubuntu-default/gtk-3.0/gtk-widgets-borders-radiance.css

.primary-toolbar .button,
.menubar.toolbar .button,
.header-bar .button {
    border-image: url("assets/radiance-button-toolbar.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .button:focused,
.menubar.toolbar .button:focused,
.header-bar .button:focused {
    border-image: url("assets/radiance-button-toolbar-focused.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .button:active,
.menubar.toolbar .button:active,
.header-bar .button:active {
    border-image: url("assets/radiance-button-toolbar-active.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .button:active:focused,
.menubar.toolbar .button:active:focused,
.header-bar .button:active:focused {
    border-image: url("assets/radiance-button-toolbar-active-focused.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .button:backdrop,
.menubar.toolbar .button:backdrop,
.header-bar .button:backdrop {
    border-image: url("assets/radiance-backdrop-button-toolbar.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .button:active:backdrop,
.menubar.toolbar .button:active:backdrop,
.header-bar .button:active:backdrop {
    border-image: url("assets/radiance-backdrop-button-toolbar-active.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .entry,
.menubar.toolbar .entry,
.header-bar .entry {
    border-image: url("assets/radiance-entry-toolbar.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar .entry:focus,
.menubar.toolbar .entry:focus,
.header-bar .entry:focus {
    border-image: url("assets/radiance-entry-toolbar-focused.png") 10 12 10 12 / 10px 12px 10px 12px stretch;
}

.primary-toolbar GtkComboBox.combobox-entry .button,
.primary-toolbar GtkComboBox.combobox-entry .button:focus:insensitive,
.menubar.toolbar GtkComboBox.combobox-entry .button,
.menubar.toolbar GtkComboBox.combobox-entry .button:focus:insensitive,
.header-bar GtkComboBox.combobox-entry .button,
.header-bar GtkComboBox.combobox-entry .button:focus:insensitive {
    border-image: url("assets/radiance-combobox-button-toolbar.png") 10 12 10 1 / 10px 12px 10px 1px stretch;
}

.primary-toolbar GtkComboBox.combobox-entry .button:focus,
.menubar.toolbar GtkComboBox.combobox-entry .button:focus,
.header-bar GtkComboBox.combobox-entry .button:focus {
    border-image: url("assets/radiance-combobox-button-toolbar-focused.png") 10 12 10 1 / 10px 12px 10px 1px stretch;
}

.primary-toolbar GtkComboBox.combobox-entry .button:focus:active:focus,
.menubar.toolbar GtkComboBox.combobox-entry .button:focus:active:focus,
.header-bar GtkComboBox.combobox-entry .button:focus:active:focus {
    border-image: url("assets/radiance-combobox-button-toolbar-pressed-focused.png") 10 12 10 1 / 10px 12px 10px 1px stretch;
}

.menubar.menuitem:hover,
.menubar .menuitem:hover {
    border-image: url("assets/radiance-menubaritem.png") 8 10 1 10 / 8px 10px 1px 10px stretch;
}