#carouselExampleAutoplaying{

}
#nav_bar{
    background-image: url("/images/nav/1.jpg");
    height: 600px;
    width: 200px;
    list-style-type: none;
}
#nav_bar li{
    background-image: url("/images/nav/4.png");
    height: 102px;
    width: 102px;
}
#nav_bar li a{
    width: 102px;
    height: 102px;
    display: block;
    text-align: center;
    line-height: 102px;
    color: #274665;
    font-weight: bolder;
}
#nav_bar li a:hover{
    background-image: url("/images/nav/8.png");

}