Why is my circle fill color not transparent like in the demo?

[imperium11]

In this picture i have created a circle shape to highlight the room 00 when hovered. But i would like to make the fill transparent so the number 00 can be still seen if hovered over. What do i need to do in my area.json object?

[ { "id": "0", "title": "room00", "shape": "circle", "name": "0", "fillColor": "#F5DEB3", "strokeColor": "black", "coords": [ 373, 908, 15 ], "circle": [ [373, 908, 15] ] } ]

Would like to have it transparent like so:

thank you!

[imperium11]

Sorry I just realized that i need to use a specific HEX color code!