.book {
    height: 100%;
    padding: 20px;
    background-color: #f2f2f2;
    overflow-y: auto;
}


.book {
    list-style: none;
    margin: 0;
    padding: 0;
}

.book {
    margin-bottom: 10px;
}



.book-1-text {


    font-size: 16px;
    border: none;
    background-color: transparent;
    color: #999;
}

.book-2-text {


    font-size: 16px;
    border: none;
    background-color: transparent;
    color: #999;
}

.book-3-text {


    font-size: 16px;
    border: none;
    background-color: transparent;
    color: #999;
}

.book a {
    display: block;
    padding: 10px;
    border-radius: 3px;
    background-color: #fff;
    color: #333;
    text-decoration: none;
    transition: background-color 0.2s ease-in-out;
}

.book a:hover {
    background-color: #e6e6e6;
}