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Stephen hi,
As you use id with your elements, for exemple for the one with id="btt":
//you first get that element and store it in a variable so you can use it
let btt=document.getElementById("btt");
//Then if you want to change its text color
btt.style.color="blue";
https://www.sololearn.com/learn/JavaScript/2753/
https://www.sololearn.com/learn/JavaScript/2754/
https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById