CSS : OVERLAPPING ELEMENTS

Overlapping 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:

Example

img
{
position:absolute;
left:0px;
top:0px;
z-index:-1;
}

An element with greater stack order is always in front of an element with a lower stack order.

HINT: 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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