How do I shrink the 3 pillow boxes?

Question

I am new to smartdiagram. Used to use Tikz a bit but that was more than a few years ago. For some reason, I am baffled by my inability to easily shrink the width of the three red "pillow boxes" which have my three labels "Tasks", "Tools", and "Techniques".
Thanks for any suggestions.
documentclass[tikz,border=5mm]{standalone}

usepackage[utf8]{inputenc}
renewcommand{familydefault}{sfdefault} % % to change font to the default style of sans serif:

usepackage{tikz}
usepackage{smartdiagram}
usetikzlibrary{chains, backgrounds}

begin{document}

begin{tikzpicture}

newcommand{col}{red}

tikzfading[name=priorityarrowfadingdown,
top color=transparent!5,
bottom color=transparent!80
]

tikzset{priority
arrow fill/.style={
  fill=gray,
  path fading=priorityarrowfadingdown
  }
}

begin{scope}[
   start chain=c going above,
   node distance=2mm,
   local bounding box=a,
   ]

foreach t in {
    textbf{TECHNIQUES},
    textbf{TOOLS},
    textbf{TASKS}}
  node [description, drop shadow, on chain, align=center] {t};

end{scope}

newcommand{distancemodules}{4cm}

% draw big arrow on side
node [priority arrow, left=12mm, rotate=180, transform shape, anchor=before tail] (f) at (a.north west) {}; % wdg: "left=7mm" is the distance btw the boxes and the arrow

% draw ticks on big arrow
foreach i in {1,...,3}
   draw [col, line width=5pt]  (c-i -| f.south) -- (c-i -| f.north);

end{tikzpicture}
end{document}

js bibra · Accepted Answer

The same with smartdiagram --
http://mirror.iopb.res.in/tex-archive/graphics/pgf/contrib/smartdiagram/smartdiagram.pdf
page 18-19
The default uparrow is changed with the help of tikzset
tikzset{priority arrow/.append style={rotate=180,anchor=0,xshift=30,}}

--it rotates 180 degrees (whereas the style defined is rotate=90 degrees)
--it anchors the arrow at a different point (anchor=west is default)
--it shifts the arrow downward using xshift=30 (you may need to adjust this manually, depending on the size of your diagram)
The size of boxes is changed with the help of smartdiagramset
smartdiagramset{description text width=2.6cm, description width=1cm}

documentclass[tikz,border=5mm]{standalone}

usepackage{smartdiagram}

usesmartdiagramlibrary{additions}
tikzset{priority arrow/.append style={rotate=180,anchor=0,xshift=30,}}
smartdiagramset{description text width=2.6cm, description width=1cm}
begin{document}

begin{center}
    smartdiagramset{
                    set color list={orange!50!red,orange!50!red,orange!50!red},
                    priority arrow width=2cm,
                    priority arrow height advance=2.2cm
                    }
    smartdiagram[priority descriptive diagram]{
                    textbf{TECHNIQUES},
                    textbf{TOOLS},
                    textbf{TASKS}
                }
end{center}

end{document}

Thanks to --
Change arrow orientation in smart diagram
and
@muzimuzhi

How do I shrink the 3 pillow boxes?

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