To resolve the issue of CSS styles not loading properly in Magento, start by clearing the Magento cache using the command php bin/magento cache:clean and then flush it with php bin/magento cache:flush. Next, deploy the static content again with php bin/magento setup:static-content:deploy -f. After that, check your file permissions make sure that the pub/static folder and its contents have the correct ownership and read access. If you're running in production mod, make sure you also run php bin/magento setup:di:compile. Finally, clear your browser cache or try in incognito mode to confirm that the issue isn't caused by cached files on the client side. These steps should help restore proper CSS loading in most cases.
