Chrome security warning

Hi,

On a new page that has not been indexed in Google (draft), the site where work is still underway – a few days ago Chrome started displaying a message about danger. I contacted the host – they checked the SSL certificate and everything is ok. They told me that the problem is this file. How is it possible that it’s infected? CSS is a security issue for Chrome? It’s the first time I’ve come to such nonsense. I am asking for a seugestie, which may be a problem. I will add that I use the latest version of wordpress plugins. I use Contact Form 7 and Contact Form 7 – Dynamic Text Extension – so that it dynamically retrieves the information about the product in question from the site. PLEASE HELP.

Here are the details of the problem by Google: https://transparencyreport.google.com/safe-browsing/search?url=https:%2F%2Fwamax.dfirma.pl%2Fwp-content%2Fplugins%2Fcontact-form-7%2Fincludes%2Fcss%2Fstyles.css%3Fver%3D5.1.1&hl=pl

The page I need help with: [log in to see the link]