004 Daily UI - Calculator(Day & Night)

My version of a mobile calculator for Daily UI challenge #004.
For me I find it important as a user to have a delete and clear button. I notice some have only one and is sometimes confusing to use... do I tap it once to delete or does that clear the entire screen? Do I long press to clear all? This is easy to see what you need to do without sacrificing.

Day & night version.