#sign-up {
  float: left;
  width: 45%;
  padding-right: 5%;
  border-right: 1px dotted rgb(70%,70%,70%);
}

#log-in, #errorExplanation {
  float: right;
  width: 45%;
}

h2 {
  margin-top: 0;
}

#user_system {
  display: none;
}