usepackage{smartdiagram}
begin{document}

smartdiagramset{border color = black,
    uniform color list=blue!30 for 8 items,
    bubble center node color = blue!50,
    bubble center node size=5cm,
    bubble node size=3cm
}

smartdiagram[bubble diagram]{A,
    B, C, D, E, F, G, H, I}

end{document}
````