Key Lime Pie

From one of my mom's books.

1 8oz container of cool whip
1 15oz container of sweetened and condensed milk( I use a 14 oz container)
1/3 cup lime juice
a few drops of green food coloring
graham cracker crust( make it or buy it)

Crust:
Smash about ten gram crackers mix with 3/4 stick of margarine melted. Put the crust on a pie pan. Push it up against the side until it looks like a pie crust.

Filling:
Mix all the ingredients(except for the crust) in a bowl. Fill the pie crust with the filling, chill for eight to five hours.