Positioning can be tricky sometimes!
Decide which element to display in front!
Elements can overlap!
The CSS positioning properties allow you to position an element.
It can also place an element behind another, and specify what
should happen when an element's content is too big.
Elements can be positioned using the top, bottom, left, and right properties.
However, these properties will not work unless the position property is set first.
They also work differently depending on the positioning method.
There are four different positioning methods.
HTML elements are positioned static by default. A static positioned element
is always positioned according to the normal flow of the page.
Static positioned elements are not affected by the top, bottom, left, and right properties.
An element with fixed position is positioned relative to the browser window.
It will not move even if the window is scrolled:
Note: IE7 and IE8 support the fixed value only if a !DOCTYPE is specified.
Fixed positioned elements are removed from the normal flow. The document
and other elements behave like the fixed positioned element does not exist.
Fixed positioned elements can overlap other elements.
A relative positioned element is positioned relative to its normal position.
The content of relatively positioned elements can be moved and overlap other
elements, but the reserved space for the element is still preserved in the normal flow.
Relatively positioned elements are often used as container blocks for absolutely positioned elements.
An absolute position element is positioned relative to the first parent element that has a position other than static. If no such element is found, the containing block is <html>:
Absolutely positioned elements are removed from the normal flow.
The document and other elements behave like the absolutely positioned
element does not exist.
Absolutely positioned elements can overlap other elements.
When elements are positioned outside the normal flow, they can overlap other elements.
The z-index property specifies the stack order of an element (which element should be placed in front of, or behind, the others).
An element can have a positive or negative stack order:
An element with greater stack order is always in front of an element with a
lower stack order.
Note: If two positioned elements overlap, without a z-index specified, the element
positioned last in the HTML code will be shown on top.
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