jqwidgets-framework/demos/React-TSX/splitter/api/src/App.css

jQWidgets is an advanced Angular, Vue, Blazor, React, Web Components, jquery, ASP .NET MVC, Custom Elements and HTML5 UI framework.

html, body, #root {
    padding: 4px;
}

[id^="JqxButton"] {
    display: inline;
    margin-right: 4px;
}