.flipbook-viewport .container,
.flipbook-viewport .flipbook,
.flipbook-viewport .double,
.flipbook-viewport .page {
    width: 936px;
    height: 640px;
}

.flipbook-viewport .page {
    width: 468px;
    height: 640px;
}

#tip {
    margin-left: 270px;
}

@media screen and (max-width: 1280px) {
    .flipbook-viewport .container,
    .flipbook-viewport .flipbook,
    .flipbook-viewport .double,
    .flipbook-viewport .page {
        width: 90vw;
        height: 60vh;
    }
}