A 'view source' on a node with replies reveals that each reply has "<ul class='indent'>", repeated twice for Re^3, thrice for Re^4, etc.

Adding 

ul.indent { margin-left: 5px; }

[download]
to your On-Site CSS Markup in Display Settings should do the trick.

In reply to Re: Spacing for 'reply to reply' nodes. by keszler
in thread Spacing for 'reply to reply' nodes. by myuserid7

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