Google Chrome browser will mark websites as insecure if HTTPS is not enabled.
To enable SSL on your Azure websites, you can purchase SSL certificates from many certificate authorities. Let’s Encrypt is a free, automated, and open Certificate Authority.
How to install and setup Let's Encrypt on Azure Web Apps
sjkp has done an amazing job. Following the page below to install and setup Let's Encrypt on Azure Web Apps.
*Note: Both articles' screenshots are not reflective of the latest Azure portal. However all the functionalities are still there. Please comment here if you encounter any issues and I will try my best to help.
This website now uses Let's Encrypt Certificates.