.book {
    max-width: 700px;
    background: white;
    padding: 40px;
    margin: 0 auto;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.book h2 {
    margin-top: 0;
}

.image-centre {
  text-align: centre;
}

.image-centre img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

.page-number {
    text-align: center;
    margin-top: 60px;
    font-style: italic;
    opacity: 0.6;
}

@media print {

    body {
        background: white;
    }

    header,
    .sidebar,
    .overlay,
    .hamburger {
        display: none !important;
    }

    .book {
        box-shadow: none;
        margin: 0;
        max-width: 100%;
    }

    @page {
        margin: 20mm;
    }

    @page {
        @bottom-center {
            content: "Page " counter(page);
        }
    }
}