.dropdown .dropdown {
    padding-left: 20px;
}

.dropdown-child {
    display: none;
}

.dropdown-child > p {
    padding-left: 20px;
}

.dropdown-show {
    display: block;
}

.dropdown > p:before {
    display: inline-block;
    content: '+';
    width: 10px;
    margin-left: -15px;
    margin-right: 5px;
}

.dropdown.dropdown-open > p:before {
    content: '-';
}