body {
  background-image: url('welt.jpg');
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
}

h1 {
  color: white;
  text-align: center;
  font-family: sans-serif;
  font-size: 160%;
}

p {
  color: white;
  text-align: center;
  font-family: sans-serif;
  font-size: 120%;
}

 /* unvisited link */
a:link {
  color: white;
  text-decoration: none;
}

/* visited link */
a:visited {
  color: white;
  text-decoration: none;
}

/* mouse over link */
a:hover {
  color: goldenrod;
  text-decoration: none;
}

/* selected link */
a:active {
  color: white;
  text-decoration: none;
} 

.QR {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 200px;
}

.button {
  background-color: #000000;
  color: white;
  padding: 10px 20px;
  border-radius: 10px;
  text-decoration: none;
}