Dear eric--- i'm trying to refill a 2-4 inch gap ...

dear eric--- i'm trying to refill a 2-4 inch gap in my driveway which was created when the roots of a tree got too large and shifted the asphalt completely. the tree has been removed, but i'm stuck with this 2 inch wide gap in the pavement that needs to be fixed. currently, i have used my limited resources consisting of tubes of 'ready-made' concrete and the metal trigger gun to apply it. now that it's dry the color is so, so much different from the rest of the driveway. any genius ideas in that fabulous brain of your's???!