jqwidgets-framework/demos/Angular/src/dockinglayout/fluidsize/app.component.css

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

.jqx-layout-group-auto-hide-content-vertical {
    width: 200px;
}

html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}