Codeigniter Website Showing Blank Page in AWS Elastic Beanstalk

Unless you are moving it to an environment 100% like the one you tested, things like this happen. A blank page can mean several things such as Apache works, but it isn't being routed correctly or there is a PHP error and the php.ini is set to not show errors. Time to troubleshoot by looking at the access/error logs for Apache.

I'm assuming you set the DirectoryIndex appropriately?

Yes, I've already set the DirectoryIndex in the .htaccess file.

I've tried getting the IPv4 public IP of my Elastic Beanstalk instance and pasting that to the base_url of the config file. However when I did that, it still returned a blank page.

Am I missing something else?