Hi,
This is a relatively easy fix, but only if you know what you are doing, as it is very easy to ruin your lcd.
You can get a replacement bezel frame cheap (prices vary with suppliers), this is what it looks like:
[image|3415141]
If you’re not able/confident to replace this then you can decide if you want to try and use a sealant at the missing/broken area (messy), or buy a replacement assembly with bezel already installed and do it yourself, or get repair shop to quote you on fixing the issue.
Hope this helps