ul, .tree {
    list-style-type: none;
}

.tree {
    margin: 0;
    padding: 0;
}

.caret {
    cursor: pointer;
    user-select: none;
    display: inline-block;
}

    .caret::before {
        content: "\002B";
        color: black;
        display: inline-block;
        margin-right: 6px;
    }

.caret-down::before { content: "\2212"; }

.nested {
    display: none;
}

.nested-active {
    display: block;
}

.tree .custom-control {
    display: inline-block;
}