add backspace button to the existing application if you want to do please let me know i will assign.
or if you want add more operators.

In current existing application it cannot works on decimal value calculation so modify existing code so that user can easily perform decimal value calculation as well.
if any one interested to resolve this issue by contributing to this repo please let me know, I will assign the issue.

The calculator's height and width are excessively large, and the dimensions of the buttons are not appropriately sized. This can make it difficult for people to use the calculator.