I change default language in user settings, and style CSS is broken. Also i cant change it back - button "save" not work.
Where in mysql i can change language and how.
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clear your static content folder :
rm -rf pub/static/frontend pub/static/admninhtml var/view_processed/pub
and then redploy static content :
php bin/magento setup:static-content:deploy -f
hope it will solve the issue.