Hi Ranjnish,
I can see from your other post: https://moodle.org/mod/forum/discuss.php?d=258605.
Could you see if there are any errors in the 'Network' tab of the browser developer tools please. Such as not being able to read the 'all' CSS styles. Does the issue occur in other themes on the same setup?
Is there anything in the php.log file?
Cheers,
Gareth