Orsdxy

I want to make a mindmap with tikz for my notes on political philosophy but the child nodes become so little that I cannot read what it's inside.
Here's an example:

As you can see the first nodes are easily readeble unlike the last ones.

This is the code

    begin{document}

begin{tcolorbox}[colback=red!5!white,colframe=red!75!black]

  chapter*{Liberal Equality}

end{tcolorbox}



begin{tikzpicture}[mindmap, grow cyclic, every node/.style=concept, concept color=blue!10, 

    level 1/.append style={level distance=5cm,sibling angle=90},

    level 2/.append style={level distance=3cm,sibling angle=45},]





node{Rawls}

    child[concept color=red!60]{node{He's in opposition with}

        child{node{Utilitarism}}

        child{node{Intuitionism}}

    }

    child[concept color=blue!60]{node{Two main arguments}

        child{node{Intuitive argument}

            child{node{Equality of opportunity}

                child{node{Even natural talent is an unfair help}}

            }

        }

        child{node{Original position argument}}

    }

;



end{tikzpicture}

end{document}

How can I change the code to eliminate this problem?
Thanks in advance for any answer.

This uses every node/.append style={font=normalsize}, makes a few more cosmetic changes, and has a preamble. Yes, preambles are important to attract others to look at your problem.

documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{mindmap}

begin{document}

begin{tikzpicture}[mindmap, grow cyclic, every node/.style=concept, 

concept color=blue!10, 

    level 1/.append style={level distance=5cm,sibling angle=90},

    level 2/.append style={level distance=3cm,sibling angle=45},

    level 3/.append style={level distance=3cm,sibling angle=45,

    text width=1.5cm,minimum size=2.25cm},

    level 4/.append style={level distance=3.5cm,sibling angle=45,

    text width=2cm,minimum size=3cm},

every node/.append style={font=normalsize}]





node{Rawls}

    child[concept color=red!60]{node{He's in opposition with}

        child{node{Utili\-tarism}}

        child{node{Intui\-tionism}}

    }

    child[concept color=blue!60]{node{Two main arguments}

        child{node{Intuitive argument}

            child{node{Equality of opportunity}

                child{node{Even natural talent is an unfair help}}

            }

        }

        child{node{Original position argument}}

    };



end{tikzpicture}

end{document}