This can serve as a starting point ...
\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{arrows.meta,
chains,
positioning}
\begin{document}
\begin{tikzpicture}[
node distance = 4mm,
start chain = going below,
box/.style = {fill=#1, draw,
text width=32mm, align=center,
font=\normalsize\linespread{0.8}\selectfont,
on chain, join=by arr},
arr/.style = {thick, -Stealth, thick}
]
\node [box=red!30] {xxx xxx xxx xxx};
\node [box=blue!30] {xxx xxx};
\node [box=orange!30] {xxx xxx xxx xxx xxx xxx xxx xxx};
\node [box=green!30] {xxx xxx xxx xxx xxx xxxx};
\node [box=gray!30] {xxx xxx xxx xxx xxx xxxx};
\node [box=yellow!30] {xxx xxx xxx xxx xxx xxx xxx xxx};
\end{tikzpicture}
\end{document}
Since you not provide MWE (minimal working example: a small but complete document with your flowchart beginning with \documentclass...
and ending with \end{document}
, as you can see above) it is not clear how your flowchart should looks. So, for further help, please consider comments below your question.