.add-upload .fa-plus {
  font-size: 10px;
  position: relative;
  left: -5px;
  bottom: -5px;
  text-shadow:
   -1px -1px 0 $btn-primary-background-color,
    1px 1px 0 $btn-primary-background-color,
    1px -1px 0 $btn-primary-background-color,
    -1px 1px 0 $btn-primary-background-color;
}