Website has turned completely white on live site and backend

Working on https://tothetablegrazing.com.au/ and everything has just turned completely white. There was a date picker extension already installed on this site and I was fixing a couple of little things and something has completely broken the site.

Please help! Thanks in advance.

Please see the following. Although the cause of the issue is not the same, the start of corrective action is.

It appears to me a syntax error has been introduced into the Squarekicker code.

.querySelector('#skPresets > script'))

There should be something after the above. What has been deleted I can't tell. Your best bet is to probably clear out the munged SK code and reinstall that part. Make a copy of the code that is currently there so things don't get worse by losing more code. Use it as a reference to see what needs to be fixed.

Let us know how it goes.