After changing css it just reverts to old settings

I have changed the css to customise my site colors and 24 hours later the old settings are back.
How to I prevent this from happening?

Hello John,

I suspect that you added all the styling in the default style.css then you updated the theme which officially erase any kind of information from the core files.

Ideally, to keep the CSS code in place it should be used in a child’s theme style.css

But you can use a plugin like Simple Custom CSS or something similar to make sure that it will not get erased if you update the theme and you already skipped the child theme installation.

Let me know if everything is clear enough and if there’s anything else I can assist you with.

Regards