Hey! Hope all are doing well.

I have a website which was working very well, recently i got notified by one of my friend that my site is not showing proper layout stucture on opera browser, i have also checked it on other browsers like safari, chorme, mozila firefox, etc there it was showing great results, i have checked it many times but could not found any solution for my site.
Can anyone please guide me whats wrong with it. Site is Proptinomanager
Waiting for Response, Humble Regards,
Milly
Thanks