CSS background-size property - W3Schools
https://www.w3schools.com/csSref/css3_pr_background-size.asp
The background-size property specifies the size of the background images. There are four different syntaxes you can use with this property: the keyword syntax ("auto", "cover" and "contain"), the one-value syntax (sets the width of the image (height becomes "auto"), the two-value syntax (first value: width of the image, second value: height), and the multiple … myanimelist
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