Force sidebar height 100% using CSS (with a sticky bottom image)?

Question

I\'ve been banging my head against the wall for hours trying to figure out this issue and think it must be something small I\'m missing. I\'ve searched online, but nothing

Answer 1

UPDATE: As this answer is still getting votes both up and down, and is at the time of writing eight years old: There are probably better techniques out there now. Original answer follows below.

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Clearly you are looking for the Faux columns technique :-)

By how the height-property is calculated, you can't set height: 100% inside something that has auto-height.