html,
body {
  height: 100%;
}

body {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-align: center;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}

.form-signin {
  width: 100%;
  max-width: 420px;
  padding: 15px;
  margin: auto;
}

#hiddendiv {
  width: 2px;
  visibility:hidden;
  z-index: 101;
  position: fixed;
}
#hiddenimg1 {
  position: absolute;
}
#hiddenimg2 {
  position: absolute;
}