Stage color not included when exporting to GIF

[defi5C23]

I have a stage color set to #0B0E16 but when I export to GIF I get transparent or white.  I would expect the stage color to be included or for there to be an option in the export presets. Any suggestion how to include stage color with export please?

[Joseph Labrecque]

Surest way - like in After Effects - is to simply create a solid shape with the desires stage color as the bottom-most layer. 

[Nick Gioia]

I totally agree with Joseph Labrecque.  

This is what I do.