Chrome Extension fix for Extension I made

Description

Hello, I am a newbie programmer and I need help finishing my Google Chrome Extension. I made an extension and the way it works is, you go to a particular website and when this word is found an alert pops up. It's an old fashioned alert that works as a stand-alone on javascript, it looks like this in JS code : alert("'Word' was found on this webpage."); I have this part functional. Your job will be to turn this old fashioned alert into this colorful popup I made with a short html code. It's not very long. This way when the user has the extension turned on and is browsing the website they will get a colorful "alert" instead of that boring old-fashioned alert. The "alert" we are making will not be a true alert but more of a small popup window that stays at the top center when a certain word is found. To start you off, I will send you the manifest.json, script.js, popup.html and popup.css as well as the html (with embedded css) code for the new colorful "alert."