override.yml

enabled: true

ad_units: [
  # Example
  # {
  #   url_pattern: /polygon/,
  #   unit_id: 304992,
  #   group_id: 0,      #defaults to 0
  #   width: 300,       #defaults to 1
  #   height: 250,      #defaults to 1
  #   html: '<div width="300px" height="250px"><img src="http://i.imgur.com/OsM2GBy.png"/></div>'
  # },

  {
    url_pattern: /polygon/,
    unit_id: 564364, 
    html: '<div width="300px" height="250px"><img src="http://i.imgur.com/OsM2GBy.png"/></div>'

  }
]