form {
  margin: auto;
  width: 50%;
}
.parent-container {
  text-align: center;
}

form {
  margin: auto;
  width: 50%;
}
form {
  border: 1px solid #ccc;
  padding: 10px;
}
input {
  display: block;
  margin-bottom: 10px;
}
h1, p {
  text-align: center;
}
h1, p {
  margin: 0 auto;
  width: 50%;
}
h1, h2, p {
  padding: 20px;
}

body {
  background: linear-gradient(to bottom, #ADD8E6, #FFFFFF);
}