background-image: url(https://halfhollowhills.instructure.com/images/thumbnails/536192/zgK3mBsHDuj4maEjzWpzLf8NWFSVFT4cNrPGZIeZ);width: 128px;height: 128px code example
Example: how to scale a bg image acc to size of div
/* One way */
background-size: cover;
/* Other option */
background-size: contain;