JSFiddle - React, Tailwind, and code Playground
HTML
<iframe id="iFrame" src="" width="283" height="242.5" frameborder="0"></iframe>
JavaScript
var games = [];
games[0] = "mhgxcdufRbE?rel=0&showinfo=0";
games[1] = "jrndhugilod?rel=0&showinfo=0";
games[2] = "oloprokbanse?rel=0&showinfo=0";
games[3] = "nfbeuujshre?rel=0&showinfo=0";
games[4] = "sd54ddsaegdd?rel=0&showinfo=0";
games[5] = "h5gffy73jssa?rel=0&showinfo=0";
games[6] = "ffa87gb3n21s?rel=0&showinfo=0";
var i = Math.floor( 7 * Math.random() ),
iFrame = document.getElementById('iFrame').src = 'https://www.youtube.com/embed/' + games[i]