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The idea is a box with zero width and height. The actual width and height of the arrow is determined by the width of the border.
inline element margin
Auto height on parent container with Absolute/Fixed Children
Columns method was first introduced by Dan Cederholm in his 2004 article
for A List Apart, and in his book Web Standards Solutions.
This is a simple Twitter Bootstrap 3 template. You can fork it to get a ready to use Bootstrap 3 fiddle.