.tree, .tree ul {
    margin: 0;
    padding: 0;
    list-style: none;
    margin-left: 10px;
}

    .tree ul {
        margin-left: 1em;
        position: relative
    }

        .tree ul ul {
            margin-left: .5em
        }

        .tree ul:before {
            content: "";
            display: block;
            width: 0;
            position: absolute;
            top: 0;
            bottom: 0;
            left: 0;
            border-left: 1px solid;
            border-color: #dee2e6;
        }

    .tree li {
        margin: 0;
        padding: 4px 1em;
        position: relative
    }

    .tree ul li:before {
        content: "";
        display: block;
        width: 10px;
        height: 0;
        border-top: 1px solid;
        border-color: #dee2e6;
        margin-top: -1px;
        position: absolute;
        top: 1em;
        left: 0
    }

    .tree ul li:last-child:before {
        background: #fff;
        height: auto;
        top: 1em;
        bottom: 0
    }

.indicator {
    margin-right: 5px;
}

.tree li a {
    text-decoration: none;
}

.tree li button, .tree li button:active, .tree li button:focus {
    text-decoration: none;
    border: none;
    background: transparent;
    margin: 0px 0px 0px 0px;
    padding: 0px 0px 0px 0px;
    outline: 0;
}

.tree i {
    color: #7f7f7f;
    font-size: 14px;
}

a.isSelected {
    font-weight: bold;
}