.book-container .book{
    cursor: pointer;
    width: 90%;
    margin-left: 5%;
    transform: perspective(60em) rotateX(0deg) rotateZ(0deg) rotateY(25deg);
    box-shadow: 
        1.6em 0.3em 0.9em -0.2em rgba(0,0,0,0.5), 
        0.3em 1em 1.3em rgba(0,0,0,0.3);
}

.book-container .book::after {
    content: '';
    position: absolute;
    /*top: 2rem;*/
    left: 0rem;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 5%, transparent 100%);
}

.book-container .book .book-side {
    content: '';
    position: absolute;
    left: -1.1rem;
    top: 0.1rem;
    background-color: #dddddd; 
    width: 15%;
    height: 98.5%;
    z-index: -1;
    transform: perspective(60em) rotateY(-60deg);
}

.book-container .book .book-side::after {
    content: '';
    position: absolute;
    background: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 20%, transparent 100%);
    width: 100%;
    height: 100%;
}

.modal .cover-container .cover{
    cursor: pointer;
    width: 60%;
    margin-left: 25%;
    transform: perspective(60em) rotateX(0deg) rotateZ(0deg) rotateY(25deg);
    box-shadow: 
        1.6em 0.3em 0.9em -0.2em rgba(0,0,0,0.5), 
        0.3em 1em 1.3em rgba(0,0,0,0.3);
}

.modal .cover-container .cover::after {
    content: '';
    position: absolute;
    /*top: 2rem;*/
    left: 0rem;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 5%, transparent 100%);
}

.modal .cover-container .cover .cover-side {
    content: '';
    position: absolute;
    left: -1.6rem;
    top: 0.2rem;
    background-color: #eeeeee; 
    width: 15%;
    height: 98.5%;
    z-index: -1;
    transform: perspective(60em) rotateY(-60deg);
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
}

.modal .cover-container .cover .cover-side::after {
    content: '';
    position: absolute;
    background: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 20%, transparent 100%);
    width: 100%;
    height: 100%;
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
}

.book-container-detail .book{
    cursor: pointer;
    width: 70%;
    margin-left: 17%;
    transform: perspective(60em) rotateX(0deg) rotateZ(0deg) rotateY(25deg);
    box-shadow: 
        1.6em 0.3em 0.9em -0.2em rgba(0,0,0,0.5), 
        0.3em 1em 1.3em rgba(0,0,0,0.3);
}

.book-container-detail .book::after {
    content: '';
    position: absolute;
    /*top: 2rem;*/
    left: 0rem;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 5%, transparent 100%);
}

.book-container-detail .book .book-side {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.2rem;
    background-color: #dddddd; 
    width: 15%;
    height: 98%;
    z-index: -1;
    transform: perspective(60em) rotateY(-60deg);
}

.book-container-detail .book .book-side::after {
    content: '';
    position: absolute;
    background: 
        linear-gradient(to right, transparent 2%, rgba(0,0,0,0.1) 3%, rgba(0,0,0,0.1) 4%, transparent 5%), 
        linear-gradient(to bottom, rgba(0,0,0,0.1) 20%, transparent 100%);
    width: 100%;
    height: 100%;
}

@media (max-width: 576px){
    .book-container .book .book-side {
        left: calc(-1.2rem + 4px);
        top: 0.1rem;
    }

    .cover-container .cover .cover-side {
        left: -1.2rem;
        top: 0.1rem;
        border-top-left-radius: 5px;
        border-bottom-left-radius: 5px;
    }

    .book-container-detail .book .book-side {
        left: -1.6rem;
        top: 0.1rem;
    }
}

@media (min-width: 577px){
    .book-container .book .book-side {
        left: -2.3rem;
        top: 0.3rem;
    }
}

@media (min-width: 768px){
    .book-container .book .book-side {
        left: calc(-1.7rem + 1px);
        top: 0.2rem;
    }

    .book-container-detail .book .book-side {
        left: -1.5rem;
        top: 0.1rem;
    }
}

@media (min-width: 992px){
    .book-container .book .book-side {
        left: -1.1rem;
        top: 0.1rem;
    }

    .book-container-detail .book .book-side {
        left: -2rem;
        top: 0.25rem;
    }
}