aside {
    position: fixed;
    width: 250px;
    -webkit-box-shadow: 2px 0 5px -2px rgba(0, 0, 0, 0.3);
            box-shadow: 2px 0 5px -2px rgba(0, 0, 0, 0.3);
    height: calc(100% - 64px);
    overflow-y: scroll;
    margin-top: 64px;
    z-index: 25;
    background-color: white;
}


@media screen and (max-width: 991px) {
    aside {
        transform: translateX(-250px);
        -webkit-box-shadow: none;
        box-shadow: none;
        transition: all .2s ease-in-out;
    }
    aside.active {
        transform: translateX(0);
        -webkit-box-shadow: 2px 0 5px -2px rgba(0, 0, 0, 0.3);
        box-shadow: 2px 0 5px -2px rgba(0, 0, 0, 0.3);
    }
}

aside a{
    color: rgba(0, 0, 0, 0.87);
}

aside .material-icons{
    color: rgba(0, 0, 0, 0.54);
}

aside .collapsible-header{
    border-bottom: 0;
    background-color: white;
}

aside .collapsible-header:hover{
    background-color: rgba(0, 0, 0, 0.05);
}

aside .collapsible-body {
    padding: 0;
    border-bottom: 0;
}

main, footer{
    margin-left: 250px;
}

@media screen and (max-width: 991px) {
    main, footer{
        margin-left: 0;
    }
}

aside ul ul .material-icons{
    font-size: 18px;
    line-height: 1.6rem;
}

aside ul ul ul .collapsible-header{
    padding-left: 2rem;
}
aside ul ul ul ul .collapsible-header{
    padding-left: 3rem;
}
aside ul ul ul ul ul .collapsible-header{
    padding-left: 4rem;
}

aside .collapsible {
    margin: 0;
    box-shadow: none;
    border: 0;
}

aside .collapsible .active > .collapsible-header{
    /*background-color: rgba(0, 0, 0, 0.04);*/
    background-color: rgb(244, 244, 244);
}

aside .collapsible .active .active > .collapsible-header{
    /*background-color: rgba(0, 0, 0, 0.1);*/
    background-color: rgb(227, 227, 227);
}

aside .collapsible .active .active .active > .collapsible-header{
    /*background-color: rgba(0, 0, 0, 0.16);*/
    background-color: rgb(203, 203, 203);
}

aside .collapsible .active .active .active .active > .collapsible-header{
    /*background-color: rgba(0, 0, 0, 0.22);*/
    background-color: rgb(188, 188, 188);
}

aside .collapsible-header:not(:last-child):after{
    font-family: 'Material Icons';
    content: "keyboard_arrow_down";
    color: #9e9e9e;
    font-size: 18px;
    position: absolute;
    right: 16px;
}

aside ul .mdi {
    position: absolute;
    top: .5rem;
    left: 1rem;
    color: rgba(0, 0, 0, 0.54);
}
aside ul .nav-mdi-inside {
    padding-left: 4rem;
}