Hide WIX template CSS

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CSS

Hello, I am trying to hide css from a wix template.

The link below has a screenshot of the div i want to hide highlighted in the source code.

https://bigberthacss.tiiny.site/hide.png

WIX gives you the option to add custom code to the header by linking style sheets. I can see style sheet in the source code but my custom css isnt overwriting the class.

This is the code i used in my css file.

.heading.s-separator{
display: none !important;
}

Could someone help me to understand why the "heading s-separator" div is still displaying when i view the page?

This is the website URL for reference - https://www.bigberthamotorhomes.co.uk/book-a-room/rooms/d1a1f883-3e3e-43aa-a1bc-539c68d1733b

Thanks

What I have tried:

<pre lang="CSS">.heading.s-separator{
display: none !important;
}