default image code example

Example 1: background image

div {
  background-color: #ffffff;
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-attachment: scroll|fixed|local|initial|inherit;
  background-position: right top  |  x% y%  |  xpos ypos;
  background-clip: border-box|padding-box|content-box|initial|inherit;
  background-size: auto|length|cover|contain|initial|inherit;
}
//shorthand:
div {
  background: #ffffff url("img_tree.png") no-repeat right top;
}

Example 2: create transparent placeholder img

from PIL import Image
img = Image.new('RGB', (32,32), color='white')
img.save('empty.png')
quit()

Example 3: create transparent placeholder img

convert -size 32x32 xc:white empty.jpg