Background non secure when using HTTPS


I have secured my website with a https certificate.
But i still have no padlock appear.

I have found out that this is due to some content that is not secure, it is the background of the main index page.

How can i fix this? export:
Total number of items: 63
Number of insecure items: 2
Insecure URL: (background image)
Found in:

If i use no background, then the padlock appears.

Hello there,

I hope you are doing well today.

I have checked the page and I can see the padlock in the URL with the background. Please clear your browser cache and then clear the WordPress cache with the following plugin:

Best Regards,