The fix is to adjust your stylesheet to include :-

body { line-height: 20px; }

The exact value you need is 4px larger than the font size you've used (unless you've also altered the top or bottom padding, in which case add the sum of the new values for those).

If you've set the font size in other units (e.g. points) then you'll have to adjust until the lines look right as there's no way to mix units.

If the line-height is set in other styles you may have to also adjust those if not everything is correct.