body{padding-top:90px}
.navbar.fixed-left .navbar-collapse .navbar-nav .nav-item .dropdown-menu {
    overflow-y: auto;
    max-height: 50vh;
    min-width: 250px;
}
@media (min-width:768px){body{padding-top:0}}
@media (min-width:768px){}
.navbar.fixed-left{position:fixed;top:0;left:0;right:0;z-index:1030}
@media (min-width:768px){
    .navbar.fixed-left{bottom:0;flex-flow:column nowrap;align-items:flex-start}
    .navbar.fixed-left .navbar-collapse{flex-grow:0;flex-direction:column;width:100%}
    .navbar.fixed-left .navbar-collapse .navbar-nav{flex-direction:column;width:100%}
    .navbar.fixed-left .navbar-collapse .navbar-nav .nav-item{width:100%}
    .navbar.fixed-left .navbar-collapse .navbar-nav .nav-item {top:0vh}
}
@media (min-width:768px){
    .navbar.fixed-left{right:auto}
    .navbar.fixed-left .navbar-nav .nav-item .dropdown-toggle:after{
        border-top:.3em solid transparent;
        border-left:.3em solid;
        border-bottom:.3em solid transparent;
        border-right:none;
        vertical-align:baseline
    }
    .navbar.fixed-left .navbar-nav .nav-item .dropdown-menu{left:100%}
}