The owner of a website wanted to know if more people would s…

The owner of a website wanted to know if more people would subscribe to his website if using a black vs. a blue background in the messages that ask consumers to subscribe. He conducted an AB test with the exact pictures below and found that the picture on the right drives a higher click-through rate compared to the picture on the left. He asked you to look at his AB test and conclude about the initial question he had. What would you say?