Exported Video has thin black lines on vertical edges

[eli.tchou]

An exported video with #FFFFFF (White) Stage colour has thin black lines on the left and right vertical edges of the file. Obviously I didn't place any black lines on the working file and it is problematic because it shows up on the website where the animation needs to be uploaded.

[kglad]

what are your stage w & h?

[eli.tchou]

W 1920 H 325

[kglad]

is stage size set to match contents (in the stage property's panel)?

[eli.tchou]

No, it is not. If I click on "Match contents", then the document changes dimensions to be much taller than what I need.

[kglad]

put a white rectangle 1920x325 on your bottom most layer.

[eli.tchou]

I followed your advice. Unfortunately those lines are still there 

[kglad]

is that object shown in your screenshot imported into animate?

if yes, what's its size?  do you resize it?  if yes, to what do you resize it?