JSFiddle - React, Tailwind, and code Playground

JavaScript

document.write("<pre>");
var s = "/\\";
for (var y = 0; y < 20; ++y) {
    for (var x = 0; x < 40; ++x) {
        var i = parseInt(0.5 + Math.random());
        document.write(s[i]);
    };
    document.write('\n');
};
document.write("</pre>");