CSS top Property

.example {
  position: fixed;
  top: 50px;
  border: 2px solid blue;
}

I am absolutely positioned.

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Meaning

The top property defines the y (vertical) coordinate for a positioned element, relative to the top of the enclosing object or browser window.

The effect of top depends on how the element is positioned (i.e., the value of the position property):

When position is set to absolute/fixed, the top property specifies the distance between the element's outer margin of top edge and the inner border of the top edge of its containing block.
When position is set to relative, the top property specifies the distance the element's top edge is moved below its normal position.
When position is set to sticky, the top property is used to compute the sticky-constraint rectangle.
When position is set to static, the top property has no effect.

Default value:	auto
Inherited:	No
Animatable:	Yes
Version:	CSS2
JavaScript syntax:	`object.style.top="auto\|length\|%\|initial\|inherit\|revert\|revert-layer\|unset";`

top: auto|length|%|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
auto	This is default value. The browser calculate the top edge position.
length	Defines the top edge position in px, cm, etc. Negative values are allowed.
%	Defines the top edge position in %(percentage) of containing element. Negative values are allowed.
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 {
  top: auto;
}