What you have done is changed the root address by moving it but there is a setting in Wordpress that uses that address to tell the site where the CSS is. The root address is stored in the mySQL, have a look in the databases find where the root address is stored and change it manuallly
or if you go here even if messed up you should be able to change the entry and submit the form.
http ://www.domain.co.uk/wp-admin/options-general.php
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