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CSS TUTORIALS

Positioning:

What is CSS Positioning
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.
What is Static Positioning
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.
What is Fixed Positioning & How to use it
An element with fixed position is positioned relative to the browser window.
It will not move even if the window is scrolled:
Example
p.pos_fixed {
position: fixed;
top: 20px;
right: 10px;
}
   
What is Relative Positioning & How to use it
A relative positioned element is positioned relative to its normal position.
Example
h2.pos_left {
position: relative;
left: -10px;
}
h2.pos_right {
position: relative;
left: 10px;
}
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.
Example
h2.pos_top {
position: relative;
top: -30px;
}
What is Absolute Positioning & How to use it
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>:
Example
h2 {
position: absolute;
left: 100px;
top: 150px;
}
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;
}
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