CSS background-image property - W3Schools
https://www.w3schools.com/cssref/pr_background-image.php
WebThe background-image property sets one or more background images for an element. By default, a background-image is placed at the top-left corner of an element, and repeated both vertically and horizontally. Tip: The background of an element is the total size of the element, including padding and border (but not the margin).
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