Horizontal vertical alignment center
Horizontal align can be done simply. Element has to have a fixed width and no floating applied. Width auto or 100% doesn't work here.
margin:0 auto; width:400px;
Sometimes you may need more complex horisontal alignment. Say to position a splash in the center of screen. Then you pair horisontal alignment with vertical alignment and you get "Horizontal Vertical Alignment Center". Without the margin-left and the fixed width here, the element would position itself by it's left-top corner.
height:auto; left:50%; margin-left:-200px; position:absolute; top:30%; width:400px;
2010.
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