@import url('https://fonts.googleapis.com/css2?family=Raleway:wght@500&display=swap');
body {
 background-image: url(images/muehlbach.jpg);
 background-position: center center;
 background-repeat: no-repeat;
 background-attachment: fixed;
 background-size: cover;
 background-color:#fff;
 height:100vh;
 padding:0;
 margin:0;
 font-family: 'Raleway', sans-serif;
 font-size:0.8rem;
}
a {
 text-decoration:none;
}
.box {
 padding:2rem;
 background-color:#fff;
 text-align:center;
 opacity:0.7;
 border-radius:1rem;
}
.container {
 width:100%;
 height:100vh;
 display:flex;
 justify-content:center;
 align-items:center;
}
.book {
 display:block;
 text-decoration:none;
 padding:1.5rem;
 background:blue;
 color:#fff;
 border-radius:0.5rem;
}
.book:hover {
 background:green;
}
@media only screen and (max-width: 767px) {
 body {
  background-image: url(images/muehlbach-mobil.jpg);
 }
}