I've created a custom css less file for changing customer portal
and it works.
But in some parts some classess are same in batch.css and jira program makes
batch.css with higher priority to my css
how should I treat that and changing these parts of batch.css
I don't think you're getting any answers because doing this is unsupported and strongly recommended against, so people generally don't do it.
I'd suggest looking at an add-on such as the Refined one for skinning your service desk, or at very least packaging your hacks into an add-on properly.
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