[HurtLocker]

You firstly define the gangzone area: https://sampwiki.blast.hk/wiki/GangZoneCreate

Then, you set the color: https://sampwiki.blast.hk/wiki/GangZoneShowForPlayer

This will help you on how much intense color you want: https://sampwiki.blast.hk/wiki/Colour_Em...ransparency.29

That's all volks.

P.S.1. Next time use ******.

P.S.2. Use the GangZoneForPlayer under "public OnPlayerSpawn(playerid)"
Use the GangZoneCreate under "public OnGameModeInit()"