Office UI Dialog not showing correctly on SPFX Web part

Question

On the SharePoint Workspace the UI dialog works fine. The dialog comes out when you click on Forward Case.

When I have gulp packaged the solution and adding the app (locally on gulp) then I get this when I click on Forward Case.

So the dialog needs to pop out much further and onto the main screen and not just within the web part.

Is this anything that can be done ?

Answer 1

I did simple test in my online environment while can't reproduce.

I think this related to CSS, you'd better use developer tool to debug/compare the CSS difference.