h1 {
  text-align: center;
}

fieldset {
  width: 20em;
  margin-left: auto;
  margin-right: auto;
}

label {
  float: left;
  width: 10em;
  clear: left;
}

input {
  float: left;
}

button {
  display: block;
  margin-left: auto;
  margin-right: auto;
  clear: both;
}