Migrated Magento website css errors

I am looking for someone to help me with a migrated Magento website - the site is still live on its current server but we are doing a trial migration to fix any possible configuration errors. The website is not functioning properly due to formatting problems probably due to css. For an experienced Magento developer this is probably a few minutes work but there is the potential for plenty of ongoing work and upgrades for this client plus others that we host. We are therefore looking for quotes at the bottom end of the offered range - anything else will simply be ignored