Fondos

E {
  background-color: color || #hex || (rgb / % || 0-255);
  background-image:url(URI);
  background-repeat: repeat || repeat-x || repeat-y || no-repeat;
  background-position: X Y || (top||bottom||center) (left||right||center);
  background-attachment: scroll || fixed;
}

E {
    background-color: transparent;
    background-image: none;
    background-repeat: repeat;
    background-position: top left;
    background-attachment: scroll;
}

E {
  background: #fff url(image.png) no-repeat 20px 100px fixed;
}

E {
  background:red url(image.png);
}