Fontawesome not working in HTML tour template

I have followed the instructions of how to insert icons from FontAwesome however this does not work. I have looked at the css and I think it might have something to do with it referring to an old version of it - 4.4.0 whilst the latest version on their website is 6.0. What do I need to change to get this working? I am using the HTML template not the WordPress one.
Thanks.

Hello Abeigh, please share your URL so that I can see and figure what you may be missing. Thank you.

Hi there

The URL is https://luxevacays.co.uk/

Also, could you just tell me how to remove the grey overlay from the banner images.

Thanks.

Hello, we are updating the theme and in next version we will update FontAwesome to latest version as well. For you, you can continue with the version shipped with the theme. You can find the vversions here: Font Awesome

Thank you

I looked at this before I contacted you and it still doesn’t work. It’s very hit and miss as to which icon show. I guess I’ll wait for the updated theme.

Could you also tell me how to remove the grey overlay from the banner images.

Thanks.