I'm using SharePoint Online 2019 and I have to customize out of the box menu. I would like to know if it is fine to directly override SharePoint classes or I have to add a selector or custom class on top and then change the theme. What is the best practise to follow?


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If you are using modern SharePoint, this is not a supported customisation. You should instead follow the advice Microsoft have given on customising the modern experience.

If you are using classic SharePoint sites, then you can apply your own stylesheet using the Alternate CSS URL option that comes with the publishing feature. Though you should follow Microsoft's advice on what should or shouldn't be customised.

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