awesome-uiwidgets/AwesomeUIWidgets/Assets/Scripts/RaycastableScene/RightUIPanel.cs

using System.Collections.Generic;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using TextStyle = Unity.UIWidgets.painting.TextStyle;

namespace UIWidgetsSample.RaycastableScene
{
    public class RightUIPanel : StatelessWidget
    {
        public override Widget build(BuildContext context)
        {
            return new Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children : new List<Widget>{
                    new Text("HOW TO PLAY: \n " +
                             "(1) Change lights using the switcher and slider at the top;\n " +
                             "(3) Zoom/Hide/Show a Origami using the list on the left;\n " +
                             "(4) Click on the Origami and drag to rotate it;", style: new TextStyle(color: Color.white, fontSize: 8f))}
                );
        }
    }
}