JSFiddle - React, Tailwind, and code Playground

CSS

.hidden {
    display: none;
}

JavaScript

var chars = "0123456789";
var string_length = 3;
var num_chars = chars.length;
var result1 = '';
var result2 = '';
var result3 = '';

while(string_length--) {
    result1 += chars[Math.floor(Math.random() * num_chars)];
    result2 += chars[Math.floor(Math.random() * num_chars)];
    result3 += chars[Math.floor(Math.random() * num_chars)];

}
$('body').prepend(result1 + '<br>'+result2 + '<br>'+result3 + '<br>');