Select the desired color to make the background of that particular color.
function change(){
let c = document.getElementById("selector").value;
document.getElementById("colorselector")
.style.backgroundColor = c;
}
Select the desired Number whom you want to find LCM and HCF.
function idk() {
var a = document.getElementById("n1").value;
var b = document.getElementById("n2").value;
x = [a,b];
x.sort();
var hcf
var r
if(x[1]%x[0]==0){
hcf = x[0];
}else{
r = x[1] % x[0];
while(r!=0){
x[1] = x[0];
x[0] = r;
r = x[1] % x[0];
hcf = x[0];
}
}