Getting Blocked loading mixed active content error message

I'm getting following error even when I've added https in place of http and also tried writing slashes // but still it's the same. I've checked code in browser and it's using https protocol then why it's giving this error?

Blocked loading mixed active content “http://ift.tt/2lPqzvn”

here is the link of my website: http://ift.tt/2lWIRXx

it's in Laravel and I've also added https in .env file for App Url.

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