These are chat archives for openseadragon/openseadragon
backgroundproperty on the div that OSD is set to use.
background-colorproperty on the
#contentDivto whatever you want, and it changes the colour shown behind/around the image. Also quickly shows it at https://codepen.io/anon/pen/JErEEm, where we set the background-color to #ff0707, a nice garish red.