background-imageThe background-image CSS property sets the graphics to display behind the content of an element and in front of the background color. Graphics may be any combination of images or gradients.backgroundBackgroundwidely2015-07-292018-01-29https://drafts.csswg.org/css-backgrounds-3/#background-imagehttps://developer.mozilla.org/docs/Web/CSS/Reference/Properties/background-imagecss.properties.background-imagecss.properties.background-image.multiple_backgroundscss.properties.background-image.nonehttps://nowyoucanuse.com/features--background-image.html