Dynamic design

Hello, I have 1000 custom buttons and they have the same design (font size , font color).
Problem is if i i want to change any propriety , i will change each one alone.
So i want to make a script to hold these configurations so if changed any propriety in this script , it will change for all

You can use the custom:button-card where there is a possibility to create templates to reuse in various buttons and avoid a lot of repetitions:

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Thank you, this helped me alot.