A little something to get you started

We have a simple website like this one:

We can read the HTML source code of the website, which is:

There is an image called background.png, but we did not observe any image on the website. We can try to access it using curl:

$ curl http://35.190.155.168/9a968e7787/background.png
^FLAG^xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx$FLAG$  

And we have the flag.