Bro, since your dinner is quite close to your workout time, would be best, if you make your dinner also as a pre-workout meal @ containing high energy food (refer to bro alien link).

Or bro, you can just push your dinner after your workout and consume banana (as per bro degraw suggest) as pre-workout snacks so that you can get that pump at gym without having bloated stomach.

Or bro, you can consume pre-workout supplement but since your workout is at night, try to avoid those caffinated supps.

Lastly bro, in bodybuilding, drinking a whey supplement during brunch or snacking between dinner and supper is called meal. Even a pre-workout meal can be 2 bananas and a cup of black coffee (mine is a shot of double espresso). Dont confuse that with the English meaning of meal ya.

And bro, just asking, how much calorie you consume per day ya?