Black bordes in arts exported to instagram

[Hperick]

Hi, I uploaded a social media story to Instagram and I realize that elements have a black border like a shadow but I originally weren't in that way. 

 Do you have any idea about what I have to do to exported better?

Thank you so much!

[Jacob Bugge · Accepted solution]

Hperick,

Social media are notorious for destroying/uglifying artwork. If it looks fine on your computer, the reason is simply Instagram.

Obviously, following the upload instructions may reduce the suffering.