body {
    overflow: hidden;
}
/* book setting */
.book-container {
    width: 100%;
    height: 89%;
    position: fixed;
    top: 8em;
    margin: 0 auto;
    overflow: hidden;
}

.book-wrapper {
    width: 100%;
    height: 100%;
    max-width: 660px;
    max-height: 880px;
    margin: 0 auto;
    direction: ltr;
    overflow: auto;
}

.book-page {
    width: 600px;
    height: 880px;
    margin: 0 auto;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}
.img {
    width: 100%;
    height: 100%;
}
/* book index */
.index-btn-n {
    width: 100%;
    height: 100%;
    background-image: url(../images/index-menu-right-yel.svg);
    background-repeat: no-repeat;
    background-size: contain;
    background-position: left;
    background-color: transparent;
    border: none;
}

.index-btn-n:hover {
    background-image: url(../images/index-menu-right-red.svg);
}

.index-btn-m {
    background-image: url(../images/index-menu-right-yel.svg);
    background-repeat: no-repeat;
    background-size: contain;
    background-position: right;
    background-color: transparent;
    border: none;
    width: 100%;
    height: 100%;
    float: right;
}

.index-btn-m:hover {
    background-image: url(../images/index-menu-right-red.svg);
}

.book-index {
    width: 100%;
    height: 94%;
    text-align: right;
    overflow: auto;
}
.book-index h3 {
    font-size: 1.5em;
    color: #FBFBDC;
    margin-right: 20px;
    margin-top: 30px;
    margin-bottom: 20px;
}

.book-index li a {
    padding: 0.5 0;
    margin: 0 5px;
    text-decoration: none;
    font-size: 1.1em;
    color: #FBFBDC;
    display: block;
}

.book-index li a:hover {
    background-color: #FBFBDC;
    color: #880000;
    border-radius: 3px;
}

/* Media Queries for side nav */
@media screen and (max-width: 450px) {
.book-container {
    height: 82%;
}

.book-wrapper {
    max-width: 360;
    max-height: 700px;
}
    
.book-page {
    width: 360px;
    height: 530px;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}
.book-index {
    height: 91%;
}
}