CSS background-attachment Property

body {
  background-image: url("smiley.png");
  background-repeat: no-repeat;
  background-attachment: fixed;
}

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Meaning

The background-attachment CSS property sets whether a background image's position is fixed within the viewport, or scrolls with its containing block.

Default value:	scroll
Inherited:	No
Animatable:	No
Version:	CSS
JavaScript syntax:	`object.style.backgroundAttachment="scroll\|fixed\|local\|initial\|inherit\|revert\|revert-layer\|unset";`

background-attachment: scroll|fixed|local|initial|inherit|revert|revert-layer|unset;

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

The following table describes the values of this property.

Value	Description
scroll	The default value. The background image is fixed with regard to the element itself and scroll within the viewport along with its containing element.
fixed	The background image is fixed with regard to the viewport and doesn't move with the element.
local	The background image stays fixed with regard to the element's contents.[if the element has a scrolling mechanism, the background scrolls with the element's contents.]
initial	Sets this property to its default value.
inherit	If specified, the associated element takes the computed value of its parent element animation-delay property.
revert	Reverts the cascaded value of the property from its current value to the value the property
revert-layer	Rollback styles to the ones specified in previous cascade layers.
unset	Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.

selectors {
  background-attachment: scroll;
}