Keywords: such as top, right, bottom, left, center
Length values, such as PX, EM, REM, etc.
The most commonly used values, or best known values, are keywords and length values, with percentages of up to 0%, 50%, and 100%.
In the background picture position property, the property value generally has 2, the first represents the horizontal position, is the x axis, the second represents the vertical position, that is, the Y axis, using two attribute values to define the starting position of the background picture, if the starting position of the two direction is the same, you can use a value.
The meanings of some of these property values are as follows:
Top: The initial position of the background image is the top of the element
Center: The starting position of the background image is the middle of the element
Left: The starting position of the background picture is the element
Right: The starting position of the background picture is the element
Bottom: The starting position of the background image is the bottom of the element
Example: Setting the background image to the left and bottom, while defining the background image uneven.
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The above is a brief introduction of background-position, hope to help you!