#featuresNav ul li .active
to
#featuresNav ul li.active

is not always a mistake. The second states I want the li that has a class of active the first states that you want an li that has or contains the class active. So if you were to put the class on the li tag you would want the li.active if you were going to put it on the a tag you would want the li .active.

Second line height is one of those things you try to avoid as it is not 100% implemented in all the browsers. So you may get funky results when its combined with different things.

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