documentclass[tikz,border=1mm]{standalone}

definecolor{brownMedium}{HTML}{623d22}
definecolor{brownLight}{HTML}{a78d7b}
definecolor{brownDark}{HTML}{573722}

begin{document}

    begin{tikzpicture}
        edefw{10} edefh{6}

        begin{scope}[shift={(0,0.5)},scale=1.1]
            draw[color=brownDark, fill=brownDark,thick] (0,w) -- (0,0) -- (w,0)  -- (w,w);
            draw[color=brownDark, fill=brownDark, thick] (w,w) arc(0:180:0.5*w);
        end{scope}

        draw[color=brownMedium, thick, fill=brownMedium] (0,w) -- (0,0) -- (w,0)  -- (w,w);
        draw[color=brownMedium,thick, fill=brownMedium] (w,w) arc(0:180:0.5*w);

        draw[color = brownLight, fill=brownLight, thick] (0.65*w,-h) arc(0:-180:0.15*w);
        draw[fill=brownLight, color = brownLight, thick] (0.65*w,0) -- (0.65*w,-h) --  (0.35*w,-h) -- (0.35*w,0);
    end{tikzpicture}

end{document}