BUG: Empty panels are showing

[TutorialMan7727]

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Opera 109

Reproducible demo link

https://jsfiddle.net/9zmyrhoe/

Describe the bug

How to reproduce the bug?
Open the jsfiddle above and run

What is the expected behavior?
The panels not meant to show

What is the current behavior?
Black empty panels

Please feel free to ask for any extra information

Code of Conduct

• I agree to follow this project's Code of Conduct

[TutorialMan7727]

So, the CSS below didn't work. I had to manually change the CSS in the grapes.min.css file.
The CSS couldn't override the CSS in grapes.min.css.
.gjs-cv-canvas { top: 0; width: 100%; height: 100%; }