The position CSS data type represents information for positioning an element in horizontal and vertical directions using a mix of keywords, percentage, and length values. The position data type is used in the background-position and offset-anchor properties.
position = [
[ left | center | right ] || [ top | center | bottom ]
|
[ left | center | right | length-percentage ]
[ top | center | bottom | length-percentage ]?
|
[ [ left | right ] length-percentage ] &&
[ [ top | bottom ] length-percentage ]
]