urfatBro/public/plugins/metismenu/demo/assets/css/mm-vertical-hover.css

.sidebar-nav {
    background: #212529;
}
.sidebar-nav ul {
    padding: 0;
    margin: 0;
    list-style: none;
    background: #212529;
}

.sidebar-nav .metismenu {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
}

.sidebar-nav .metismenu > li {
    /*-webkit-box-flex: 1;
    -ms-flex: 1 1 0%;
    flex: 1 1 0%;*/
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    position: relative;
}
.sidebar-nav .metismenu a {
    position: relative;
    display: block;
    padding: 15px;
    color: #adb5bd;
    outline-width: 0;
    transition: all .3s ease-out;
}

.sidebar-nav .metismenu a:hover,
.sidebar-nav .metismenu a:focus,
.sidebar-nav .metismenu a:active {
    color: #f8f9fa;
    text-decoration: none;
    background: #0b7285;
}

@media (min-width: 992px) {
    .sidebar-nav .metismenu li {
        position: relative;
    }
    .sidebar-nav .metismenu > li > ul {
        position: absolute;
        left: 100%;
        top: 0;
        min-width: 200px;
        z-index: 1001;
    }
    .sidebar-nav .metismenu > li:hover > ul {
        height: auto !important;
    }
    .sidebar-nav .metismenu > li:hover > ul,
    .sidebar-nav .metismenu > li:hover > ul.collapse {
        display: block;
    }

    .sidebar-nav .metismenu > li:hover > a.has-arrow:after {
        transform: rotate(135deg);
    }
}