Blue arrow in the middle of my HTML

Hello all, I'm a master's student trying to add some custom code to my Qualtrics survey (HTML, CSS, JS). In short, we made a game that generates variables based on the player's decisions. Everything works fine when I boot up the program from my computer, but for some reason the game won't start on Qualtrics and a massive blue arrow inherent to Qualtrics appears right in the middle of my html. Another file that I've been basing this project managed to replace the blue arrow with a red double arrow that appears at the bottom right hand corner of the screen [>>]. Does anybody know how to do this? I'm also having an issue where the game appears in preview mode, but won't start up when I publish and use an anonymous link. Any help would be greatly appreciated, I can send some of the code if that helps.