No problem, we'll add it.

Scroll to the end of the file and add this:

.mainlevel-left {line-height:20px}

This means that the "mainlevel-left" named style will have a line height of 20 pixels. The period is placed in front of the name to indicate that this is a "custom" class, that is a name we (or someone) made up, not the name of a standard HTML element like BODY.

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