Updated to wordpress 5.6 got black screen of death

Hi. Im no developer, the site is for my business and since updating I have black screen with a white cross on top right. Is this a theme issue? I will roll back to previous version but need to sort the website. Any help an suggestions much appreciated.
https://www.amberarts.co.uk/

Hello, @gp_amberarts,

Thanks for writing to us.

There might be a few different reasons for this issue, I would suggest you troubleshoot with a few of the common issues before we investigate your settings.

  1. Testing for Plugin Conflict
  2. CSS/JS Customization
  3. Version Compatibility
  4. Disabling Cache

If none of those work, please send your details in a secure note. Please provide the following details

  • WordPress Login URL
  • Admin level username and password

You can find the Secure Note button at the bottom of your posts

Thanks

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