When I was a new owner I read about all the cars that ran a needle under the middle line and worried because mine ran, and still does, a needle over the line. You don't have a problem but for piece of mind: Make sure you have no leaks. Make sure the coolant tank is at the correct level. Check that the fan is working. Clean the radiator if it's dirty or clogged with bugs .......... I'm sure I'm missing some more easy things to do but, as I said, I think it's more or less normal for the majority of us.

Les