body {
  transition: 0.3;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

#authentication {
  -webkit-user-select: none;
  /* Chrome, Safari, Opera */
  -moz-user-select: none;
  /* Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
  user-select: none;
  /* Non-prefixed version, currently supported by most modern browsers */
}