.pack-nav {
    position: fixed;
    left: 0;
    top: 250px;
    width: 100px;
    z-index: 100;
    display: none;
}

.back-nav-btn {
    display: inline-block;
    text-align: center;
    width: 65px;
    padding: 10px 2px;
    background-color: deepskyblue;
    color: white;
    border: 1px solid #c5c5fd;
    border-radius: 0 10px 10px 0;
    margin-bottom: 5px;
    font-size: 12px;
}