Fix bootstrap modal body offset bug

fix-modal-offset.js

function fixModalOffet() {
    var el = document.createElement("div");
    el.style.width = "1px";
    el.style.height = "1px";
    el.style.overflow = "scroll";
    el.style.position = "absolute";
    el.style.top = "-9999px";
    document.body.appendChild(el);
    var style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = ".modal-open, .modal-open .navbar-fixed-top { padding-right: " + ((el.offsetWidth - el.clientWidth) || 15) + "px }";
    document.body.removeChild(el);        
    document.getElementsByTagName('head')[0].appendChild(style);
}