Create guides on a webpage

Guides.js

(function () {
    'use strict';
    var vGuidePos = '50%';
    var hGuidePos = '50%';
    var vguide = document.createElement('div');
    var hguide = document.createElement('div');
    var vstyle = vguide.style;
    var hstyle = hguide.style;
    vstyle.borderLeft = ' 1px solid red';
    vstyle.width = '1px';
    vstyle.height = '100%';
    vstyle.position = 'fixed';
    vstyle.top = '0';
    vstyle.zIndex = '99999999';
    vstyle.left = vGuidePos;
    
    hstyle.borderTop = ' 1px solid red';
    hstyle.width = '100%';
    hstyle.height = '1px';
    hstyle.position = 'fixed';
    hstyle.top = hGuidePos;
    hstyle.left = '0';
    hstyle.zIndex = '99999999';
    document.body.appendChild(vguide);
    document.body.appendChild(hguide);
    
})();