.flipbook-outer {
    width: 100%;
    margin: 2rem auto;
    text-align: center;
}

.flipbook-book {
    width: 100%;
    margin: auto;
}

/* Hauptcontainer */
#flipbook {
    width: 100%;

    position: relative;

    display: flex;
    align-items: center;
    justify-content: center;
}

/* Wrapper */
.flipbook-wrapper {
    width: 100%;
    max-width: 1100px;

    margin: 2rem auto;

    background: white;

    box-shadow: 0 10px 30px rgba(0,0,0,.15);
}

/* Cover + Rückseite */
.flipbook-wrapper.is-single-page {
    max-width: 550px;
}

/* Responsive Canvas */
.flipbook-wrapper canvas {
    width: 100%;
    height: auto;

    display: block;
}

/* Pfeile */
.flipbook-arrow {
    position: absolute;

    top: 50%;

    transform: translateY(-50%);

    width: 60px;
    height: 60px;

    border: none;
    border-radius: 50%;

    background: rgba(0,0,0,.45);

    color: white;

    font-size: 2rem;

    cursor: pointer;

    transition: all .2s ease;

    z-index: 20;
}

/* Abstand zum PDF */
.flipbook-prev {
    left: 2rem;
}

.flipbook-next {
    right: 2rem;
}

.flipbook-arrow:hover {
    background: rgba(0,0,0,.65);

    transform: translateY(-50%) scale(1.05);
}

/* Deaktivierte Buttons */
.flipbook-arrow:disabled {
    opacity: .6;
    cursor: default;
}

/* Tablet + Mobile */
@media (max-width: 991px) {

    .flipbook-wrapper {
        max-width: calc(100vw - 1rem);
    }

    .flipbook-wrapper.is-single-page {
        max-width: calc(100vw - 1rem);
    }

    /* kleinere Buttons */
    .flipbook-arrow {
        width: 40px;
        height: 40px;

        font-size: 1.25rem;
    }

    .flipbook-prev {
        left: 0.25rem;
    }

    .flipbook-next {
        right: 0.25rem;
    }

}

/* Kleine Smartphones */
@media (max-width: 768px) {

    .flipbook-arrow {
        width: 35px;
        height: 35px;

        font-size: 1.25rem;
    }

}

/* Animationen */

.flipbook-wrapper {
    position: relative;

    transition:
        transform .45s ease,
        opacity .45s ease,
        box-shadow .45s ease;
}

/* Nächste Seite */
.flip-next {
    animation: flipNext .45s ease;
}

/* Vorherige Seite */
.flip-prev {
    animation: flipPrev .45s ease;
}

@keyframes flipNext {

    0% {
        transform:
            perspective(1600px)
            rotateY(-12deg)
            translateX(40px);

        opacity: .6;
    }

    100% {
        transform:
            perspective(1600px)
            rotateY(0)
            translateX(0);

        opacity: 1;
    }

}

@keyframes flipPrev {

    0% {
        transform:
            perspective(1600px)
            rotateY(12deg)
            translateX(-40px);

        opacity: .6;
    }

    100% {
        transform:
            perspective(1600px)
            rotateY(0)
            translateX(0);

        opacity: 1;
    }

}