Divs and their properties:

width: px / %
height px / %
background-color: rgb / hsl / hex# / color name
color: (changes text color for whole div) rgb/hsl/hex#/color name
margin:auto (centers div on page horizontally, can only see effect if less than 100%
background-image:url('https://www.image.jpg')
background-size: px / % of div
background-repeat: repeat / repeat-x / repeat-y / no-repeat
background-position: words (top left / left top / center top / bottom right) or x-pixels y-pixels (50px 150px)
background-attachment: scroll / fixed