spectre.console/examples/Console/Panels/Program.cs

namespace Spectre.Console.Examples
{
    public static class Program
    {
        public static void Main()
        {
            var content = new Markup(
                "[underline]I[/] heard [underline on blue]you[/] like panels\n\n\n\n" +
                "So I put a panel in a panel").Centered();

            AnsiConsole.Write(
                new Panel(
                    new Panel(content)
                        .Border(BoxBorder.Rounded)));

            // Left adjusted panel with text
            AnsiConsole.Write(
                new Panel(new Text("Left adjusted\nLeft").LeftAligned())
                    .Expand()
                    .SquareBorder()
                    .Header("[red]Left[/]"));

            // Centered ASCII panel with text
            AnsiConsole.Write(
                new Panel(new Text("Centered\nCenter").Centered())
                    .Expand()
                    .AsciiBorder()
                    .Header("[green]Center[/]")
                    .HeaderAlignment(Justify.Center));

            // Right adjusted, rounded panel with text
            AnsiConsole.Write(
                new Panel(new Text("Right adjusted\nRight").RightAligned())
                    .Expand()
                    .RoundedBorder()
                    .Header("[blue]Right[/]")
                    .HeaderAlignment(Justify.Right));
        }
    }
}