title: AWS S3 -> Elastic Beanstalk - Mixed content error
body: <p>I have a frontend deployed on S3 using https. 
  When frontend request backend API (load balancer -> elastic beanstalk) then I got an error: Mixed content. 
  I know that it is because I am calling API via HTTP, not https. </p>
  
  <p>My question is:
  Should I create a brand new SSL certificate for my LoadBalancer?
  And how to do this if my load balancer DNS address looks like this: 
  awseb-address.region.elb.amazonaws.com (A Record)</p>
  
  <p>I tried to use this address in Certificate Manager but it is not accepting it. </p>