Unfortunately Docusaurus did/does not remove visually hidden elements from the tab order, which is an a11y problem (more specifically it was probably with TalkBack on Android in my testing). The CSS was introduced as a quick fix, feel free to remove.
I believe this is due to: https://github.com/Maps4HTML/web-map-doc/blob/7e0242ce719fb38dd6a9d18aadb45a5a3350b9f2/src/css/custom.css#L52-L66
Unfortunately Docusaurus did/does not remove visually hidden elements from the tab order, which is an a11y problem (more specifically it was probably with TalkBack on Android in my testing). The CSS was introduced as a quick fix, feel free to remove.