How do I prevent Google map from being dragged out of the upper and lower boundaries?

Gray edges appear when dragging the map up and down when using Google map api

try to check the google.maps.LatLngBounds configuration of Google whether it is not configured or has nothing to do with it. The demo in the gooelp document will also pull out the gray border, but the Google official map can stop dragging when dragging to the top. Where can this effect be configured?

Google-Map google-maps javascript
Mar.30,2021

Previous: The problem of grouping of TP5.1 routing Middleware

Next: Is there any way to remove special symbols in smarty?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b384cc-2b467.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b384cc-2b467.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?