Prototype:
https://www.figma.com/proto/VRgWAoXJetzVbIQaMc6ZK2/Calculator?type=design&t=k1Q3pj5Gm4yQlTIF-1&scaling=scale-down&page-id=0%3A1&starting-point-node-id=11%3A243&node-id=1-4&mode=design
