CSS disclosure, cut diagram

The book says a key point, the illusion of vision: The midpoint of the visual point in the position of a bit (silently say to yourself, do not use pixels, do not dig a hole for yourself ...) )

. center-display. object{  Position:absolute;  width:0.5em;  height:0.5em;  top:0;  Bottom:0.8em;  left:0;  right:0;  Margin:auto Auto;  border-radius:50%;  Background-color:red;text-indent: -300em;}. Center-display:nth-child (2). object{  bottom:0;}

Centered and biased a little bit of code, can you see which is really in the center?

Get busy living, or get busy dying.

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