Thanks for the kind words! So, I actually built the game in a fixed resolution. Would it be better to build it in a large resolution so the Fullscreen button will work? (Sorry I get kind of lost when it comes to building games).
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Oh alright. So, I'm not exactly sure but I think it had something to do with me resizing the game canvas in unity. So pretty much I went to build settings, then I think I went to player settings. I clicked on WebGL and from there I went scrolled down a little and clicked resize or something like that. And then it gives you pixel values to set as your game's resolution. I hope that made sense, I'm sure there are YouTube videos about it too if that helps.