CKEditor not visible in app

After following the quick start from CKEditor documentation here. I observe that the component is created but it is not visible. Has anyone encountered a component not visible due to CSS problems before? If so, how can it be solved? Thank you in advance.

Have you loaded the CSS yet with either loadCSSFromString() or loadCSSFromURLAsync()

Discovered that it is my own problem and has nothing to deal with Airtable. Sorry about it.