html, body
{
  height: 100%;
}

body {
  padding: 30px;
}

.center-div {
  margin: 0 auto;
  width: 200px;
  height: 200px;
}

form {
  font-size: 16px;
  margin-top: 10px;
}

input {
  color: #000000;
}

.btn {
  margin-top: 5px;
}