background-image: url("https://clips-media-aka.warnermediacdn.com/nba/clips/2021-01/83293-a63e1df538834494b0ae7f9841e99851/images/1610908517500-Jones-Jr_Get_to_know_Brooke_v2-83293-3.png"); code example

Example: background-image url( background.png )

body {
  /* Base64 encoded transparent gif */
  background: url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7);
}