Position: fixed trong css w3schools

Position an <h2> element:

h2 {
  position: absolute;
  left: 100px;
  top: 150px;
}

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More “Try it Yourself” examples below.

The position property specifies the type of positioning method used for an element (static, relative,
absolute, fixed, or sticky).

The numbers in the table specify the first browser version that fully supports the property.

Note: The sticky value is not supported in Internet Explorer or Edge 15 and earlier versions.

position: static|absolute|fixed|relative|sticky|initial|inherit;

ValueDescriptionDemostatic
Default value. Elements render in order, as they appear in the document flow
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absolute
The element is positioned relative to its first positioned (not static) ancestor element
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fixed
The element is positioned relative to the browser window
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relative
The element is positioned relative to its normal position, so “left:20px” adds 20 pixels to the element’s LEFT position
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sticky
The element is positioned based on the user’s scroll position

A sticky element toggles between relative and fixed, depending on the scroll position. It is positioned relative until a given offset position is met in the viewport – then it “sticks” in place (like position:fixed).

Note: Not supported in IE/Edge 15 or earlier. Supported in Safari from version 6.1 with a -webkit- prefix.
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initial
Sets this property to its default value. Read about initial

inherit
Inherits this property from its parent element. Read about inherit