Today, Gmail has turned 21. It is reportedly the most popular email platform, with over two billion users worldwide.

1. Heat the oven to 350 degrees Fahrenheit with a rack in the middle position. 2. Grease two 8-inch round metal cake pans and line the bottoms with parchment paper. 3. Whisk together the flour, ...

Pipe ‘Happy Birthday’ onto the cake (or a message of your choice) and use the remaining royal icing to stick the piped flowers onto the top and sides of the cake.