#screenCover {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 5000;
}
#login {
  margin: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 340px;
  margin-top: -223px;
  /*set to a negative number 1/2 of your height*/
  margin-left: -170px;
  /*set to a negative number 1/2 of your width*/
  border: 1px solid #ccc;
  background: linear-gradient(to bottom, #eaeaea 0, #dddddd 100%);
  box-shadow: 0 0 5px 5px #4e658d;
  border-radius: 5px;
  padding: 5px;
}
#login .errorMessage {
  color: red;
}
#login img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
#credentials {
  margin-top: 10px;
  text-align: right;
}
#credentials table {
  margin-left: auto;
  margin-right: auto;
}
#credentials table td {
  padding: 5px;
}
#credentials table td input {
  margin-left: auto;
}