css position

absolute	Generates absolutely positioned elements, positioned relative to the first parent element other than static positioning. The position of the element is specified by the "left", "top", "right" and "bottom" properties.
fixed	Generates absolutely positioned elements, positioned relative to the browser window. The position of the element is specified by the "left", "top", "right" and "bottom" properties.
relative	Generates a relatively positioned element, positioned relative to its normal position. So "left:20" adds 20 pixels to the element's LEFT position.
static	Defaults. Without positioning, the element appears in normal flow (ignoring top, bottom, left, right or z-index declarations).
inherit	Specifies that the value of the position attribute should be inherited from the parent element.