Kickoff Cupcakes

Name: Kickoff Cupcakes
Ingredients: 2 1/4 cups all-purpose flour; 2 cups sugar; 1 1/2 teaspoons baking powder; 1 teaspoon baking soda; 1/2 teaspoon fine salt; 3/4 cup unsweetened cocoa powder; 3/4 cup vegetable oil; 2 large eggs, lightly beaten; 1 tablespoon white vinegar; 2 teaspoons vanilla extract; 2 teaspoons instant coffee; 4 sticks unsalted butter, softened; 8 cups confectioners' sugar; About 2 teaspoons milk; A few drops brown food coloring; A few drops orange food coloring; A few drops yellow food coloring; A few drops green food coloring; 1 large tube white gel icing