Change the fill colour of the selected object when using the Search function in Story Maps Series

[JessNewton]

Change the fill colour to nothing when using the Location finder in a Story Map  - Map series (tabbed)

We have several thematic maps and when we use the Location/Search tool to search our layers of the map the selected area comes up with a hideaous orange colour....where can we change this colour and or get rid of it. We dont mind the aqua outline. Happy to change stuff with JSON code in the arcgis online assistant  etc. I have attcahed a screen shot of the hideous orange.