Get Any Possible Hex Color Code Using Array

HTML code

<button id="btn">

Click me

</button>

<span id="color" style="background-color: #fff"></span>

JS Code

let colors = ['0', '1', '2', '3', '4','5','6','7','8','9','A','B','C','D','E','F'];
let btn = document.getElementById('btn');
let colorCode = document.getElementById('color');

btn.addEventListener('click', function(){
let hex = '#';
for(let i = 0; i < 6; i++){
hex += colors[randomNumber()];
}
document.body.style.backgroundColor = hex;
colorCode.textContent = hex;
});

function randomNumber(){
 return Math.floor(Math.random()*colors.length);
}