To Make the Cake
1-Preheat the oven to 350°F and grease: Preheat the oven to 350°F and grease a 9×13 baking pan.
2-Add the lemon cake mix, water, canola: Add the lemon cake mix, water, canola oil, eggs, and neon green food coloring to a medium mixing bowl. Beat until well combined.
3-Add lime juice and lime zest and: Add lime juice and lime zest and mix until incorporated.
4-Pour batter into your prepared cake pan: Pour batter into your prepared cake pan and bake for 20-22 minutes (or until a knife inserted in the middle of cake comes out clean).
5-Remove from oven and allow to cool: Remove from oven and allow to cool.

To Make the Frosting
6-While cake cools, make the frosting: While cake cools, make the frosting. First, cream together softened butter and cream cheese.
7-Add powdered sugar, vanilla, lime juice, lime: Add powdered sugar, vanilla, lime juice, lime zest, and milk and beat until smooth.
8-Frost cake evenly: Frost cake evenly. Use a piping bag to add dollops, if desired.
9-Sprinkle graham cracker crumbs on top: Sprinkle graham cracker crumbs on top.