/**********************************************/
/****************** LEFT PANEL ****************/
/**********************************************/
.logo {
    width: 160px;
    height: 85px;
    margin: 25px auto 20px;
    background: center/contain no-repeat url('../img/book_logo.png');
}

.logo a {
    display: block;
    width: 100%;
    height: 100%;
}

.logo a:hover {
    background: initial;
}

nav * {
    /* color: #7a7c8d; */
    color: #9a9caa;
}

.a_wrapper {
    box-sizing: border-box;
    height: 54px;
    padding: 5px 0;
}

.a_wrapper__active {
    border-left: 2px solid #5F78E0;
}

nav a {
    display: flex;
    justify-content: center;
    flex-direction: column;
    width: 200px;
    height: 44px;
    margin: 0 auto;
    text-align: center;
    border-radius: 5px;
    transition: background .3s;
}

nav a:hover {
    background: #363c49;
}