Website Security & SSL Installation

My custom HTML/CSS website is showing a "connection not secure" message and on some laptops, it flags as malware. I need a professional to secure my website and eliminate these warnings.

Key Tasks:
- Diagnose the cause of the "connection not secure" warning
- Install an SSL Certificate if necessary
- Conduct a comprehensive security check to identify potential malware
- Implement necessary measures to secure the website
- Troubleshoot and fix any issues related to third-party scripts or plugins

Ideal Skills:
- Proficient in Custom HTML/CSS
- Extensive experience with website security
- Knowledgeable in SSL Certificate installation
- Familiar with diagnosing and troubleshooting website issues
- Able to identify and fix issues related to third-party scripts or plugins