well im glad your actually trying, not many people do that these days when it comes to websites. You tried, made it well, and seemed like you didnt have a problem putting it all together. But you should keep moving forward and challenge yourself some more.
Users can view their computers at different resolutions which means if your website isn't coded correctly it may display incorrectly to how you want it to at certain resolutions. I'm not using a resolution that big so I've no idea what the problem is