Checkboxes: spacing & vertical alignment

Hi there,

I have followed the directions to align the checkboxes vertically. Everything looks great until you expand & contract the window in Chrome (Firebox seems to be okay), to which they return to a horizontal position. Sometimes the spacing gets really wide, sometimes is stays the same.

Example 1
Example 2
Demo site

Is there a way to keep the vertical checkboxes & spacing consistent?

Thank you kindly,

Andrea

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