App feedback and some styling issues

I have finished my app so please leave some feedback. Maybe someone could help me a little bit. I don’t know why I cannot change certain css properties. For example when I target “#display h3” and want to change text-align to center nothing happens on my pc. Same when I want to set some padding so my green and red borders dont touch each other.

you have a typo:

#display h3 {
  color: black;
  text-aling: center;
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Hi thanks for fast reply. I have changed it few times and had to make this mistake. However it’s not the case. Text is still not align to center. It is on my smartphone however.