You have manipulate with theme css files.
Search for the "bullet" thing in css files and change them and see the result.
Try to change @theme_selected_fg_color to white or any other color and see the difference.
Files that has to be changed are:
Flatstudio/gtk-3.0/menu.css
Flatstudio/gtk-3.0/menu_frame.css
Inside menu.css :
Change This:
.menuitem:hover,
.menu .menuitem:hover {
/* contextual menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color: @theme_selected_fg_color;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: @theme_selected_fg_color;
}
to this
.menuitem:hover,
.menu .menuitem:hover {
/* contextual menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color: #ffffff;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: #ffffff;
}
and change this:
.menuitem.check:active:hover,
.menuitem.radio:active:hover {
border-width: 0px;
border-style: none;
background-image: none;
background-color: @theme_selected_bg_color;
color: @theme_selected_fg_color;
-unico-bullet-color: @theme_selected_fg_color;
}
to this
.menuitem.check:active:hover,
.menuitem.radio:active:hover {
border-width: 0px;
border-style: none;
background-image: none;
background-color: @theme_selected_bg_color;
color: #ffffff;
-unico-bullet-color: #ffffff;
}
Now go to the other file, menu_frame.css:
Change this:
.menuitem:hover,
.menu .menuitem:hover {
/* contextual menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color: @theme_selected_fg_color;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: @theme_selected_fg_color;
}
to this
.menuitem:hover,
.menu .menuitem:hover {
/* contextual menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color: #ffffff;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: #ffffff;
}
And Change this:
.toolbar .menuitem:hover,
Genericmenuitem .menuitem:hover,
DbusmenuGtkMenu .menuitem:hover,
.primary-toolbar .menuitem:hover,
.menubar.menuitem:hover,
.menubar .menuitem:hover {
/* dark menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color:@theme_selected_fg_color;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: @theme_selected_fg_color;
border-image: none;
}
to this
.toolbar .menuitem:hover,
Genericmenuitem .menuitem:hover,
DbusmenuGtkMenu .menuitem:hover,
.primary-toolbar .menuitem:hover,
.menubar.menuitem:hover,
.menubar .menuitem:hover {
/* dark menu item-selected */
background-image: -gtk-gradient (linear, left top, left bottom,
from (shade (@theme_selected_bg_color, 1.0)),
to (shade (@theme_selected_bg_color, 1.0)));
color:#ffffff;
text-shadow: 0px 1px @theme_selected_shadow_color;
-unico-bullet-color: #ffffff;
border-image: none;
}
At last change this:
.menuitem.check:active,
.menuitem.radio:active {
border-width: 0px;
border-style: none;
background-image: none;
background-color: @menu_bg_color;
/* contextual menu check */
color: @theme_selected_fg_color;
-unico-bullet-color: @theme_selected_fg_color;
}
to this:
.menuitem.check:active,
.menuitem.radio:active {
border-width: 0px;
border-style: none;
background-image: none;
background-color: @menu_bg_color;
/* contextual menu check */
color: #ffffff;
-unico-bullet-color: #ffffff;
}
I tested it and these are the results:
Before
After