.container {
  margin-top: 6em;
}
#change h2 {
  text-align: center;
  margin-bottom: 2em;
}
#change .error {
  color: red;
  padding-left: 1em;
}
#change .jumbotron div#ib {
  display: table;
  margin: 0 auto;
}
#change #showbtn {
  left: 5px;
  top: 5px;
  cursor: pointer;
}