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

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

.jqx-hideborder > div.jqx-splitter {
    border: none;
}

.jqx-hidescrollbars div {
    overflow: hidden;
}