Hi @Ai_Ser,
Welcome to our community! 
MonoBehaviour does not have the same colour as your classname. That indicates that there might be a problem with Visual Studio. Please watch lecture “Fixing Visual Studio Problems” (currently #4).
Also remove the System.Diagnostics namespace at the top of your script. It was probably added automatically by Visual Studio.
Did this help?
See also:
- Forum User Guides : How to mark a topic as solved