html, body {
  height: 100%;
  margin: 0;
}

body {
  background-image: url('cowsGreeting.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed; /* optional but gives "full page" feel */
  color: white;
  font-family: sans-serif;
  font-size: 42px;
  text-align: center;
  text-shadow: 
                -1px -1px 0 black,
                 1px -1px 0 black,
                -1px  1px 0 black,
                 1px  1px 0 black;
}

h1 {
  margin-top: 20px;
}

.section {
  margin: 40px 0;
}

a {
  display: inline-block;
  margin: 15px;
  text-decoration: none;
  color: purple;
}

a:hover {
  opacity: 0.5;
}