.rz-dropdown-tree-popup {
    display: none;
    font-size: 14px;
    position: absolute;
    overflow: hidden;
    width: 300px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    background-color: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}