Select the item that contains the dash or stripe you want to recolor.
2.
For a frame, choose Item > Frame (Cmd-B/Ctrl-B). For a line, choose Item > Modify, then click the Line tab. For a paragraph rule, go to Style > Rules (Cmd-Shift-N/Ctrl-Shift-N).
3.
In the Frame, Line, or Rules pane:
Choose a Color and Shade –.
Figure 2. This is a dashed frame with a 15% Black Gap color.
Figure 3. To polish it off, we added inner and outer frames in separate text boxes, both with a background color of None.
Figure 4. Light Line color, dark Gap color
Figure 5. Dark Line color, light Gap color
and/or
Choose a Gap: Color and Shade (this is not available for a paragraph rule).