@discoveryjs/discovery/lib/views/tree/tree.css

Frontend framework for rapid data (JSON) analysis, shareable serverless reports and dashboards

.view-tree {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 13px;
    line-height: 24px;
}
.view-tree:empty::before {
    content: attr(emptyText);
    color: #888;
}