body {
  background: linear-gradient(#00AADD, blue);
  min-height: 100vh;
  color: black;
  font-family: Verdana;
  font-size:18px;
  max-width: 650px;
  margin: 0 auto;
}
h1, h2, h3, h4, h5, h6 {
  text-align: center;
}
a {
  text-align: center;
}