Materialize website

main.js

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

var oneDayInMs = 1000*60*60*24;
var currentTimeInMs = new Date().getTime();  // UTC time
var timeInDays = Math.floor(currentTimeInMs / oneDayInMs);
var numberForToday = timeInDays % 9999;

var colors = ["673ab7","3f51b5","2196f3","03a9f4","0288d1","01579b","006064","26c6da","0091ea","4caf50","2e7d32","00695c","64ffda","00c853","8bc34a","ffc107","ffb300","ff9800","f4511e","bf360c","795548","9e9e9e","fafafa","9e9e9e","757575","6d4c41","607d8b","b0bec5","78909c","455a64","212121"]
var index = numberForToday % colors.length;
var color = '#' + colors[index];

addGlobalStyle('body{background-color:' +  color + ' !important;}');