body{
margin:0;
font-family:Arial;
background:#0f0f0f;
color:#fff;
text-align:center;
}

header{padding:20px;background:#000;}

.hero{padding:80px;}

.btn{
background:#c2185b;
color:#fff;
padding:12px 25px;
text-decoration:none;
display:inline-block;
margin-top:20px;
}

.book{
margin:30px auto;
max-width:300px;
}

.book img{
width:100%;
}