Change sidebar unit margins - how to increase space between widget in sidebar

How do I edit the top margin and bottom margin of each unit in the sidebar?

You can change margin below each widget by changing this margin. Add this code to Appearance >> Theme Options >> Other Custom CSS. make sure to change pixel value to get the results you were looking for.

#secondary .widget {
  margin-bottom: 100px;

Please let me know if this is what you were looking for.

It worked like a charm! thanks a lot!