StackEdit.io with background image

stackedit-backgroundimage.user.css

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("stackedit.io") {
  /* set page background image
   * adjust these rules to your flavor :)
   */
  body{
    background-color:white;
    background-image:url('<path to your background image>');
    background-repeat: no-repeat;
    background-size:40%;
    background-position:right top;
  }
  
  
  /* set semi-transparent editor background */
  #wmd-input,
  .preview-panel{
    background:rgba(255,255,255,0.5);
  }
  .navbar-default{
    background-color: rgba(74, 74, 74, 0.8);
  }
}