\begin{table}
\centering
\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]Q[]Q[]Q[]Q[]},
hline{2}={1-5}{solid, black, 0.05em},
hline{1}={1-5}{solid, black, 0.1em},
hline{7}={1-5}{solid, black, 0.1em},
row{3}={}{bg=cADD8E6},
}                     %% tabularray inner close
\tinytableDefineColor{cADD8E6}{HTML}{ADD8E6}
Sepal.Length & Sepal.Width & Petal.Length & Petal.Width & Species \\
5.1 & 3.5 & 1.4 & 0.2 & setosa \\
A & B & C & D & E \\
4.9 & 3.0 & 1.4 & 0.2 & setosa \\
4.7 & 3.2 & 1.3 & 0.2 & setosa \\
4.6 & 3.1 & 1.5 & 0.2 & setosa \\
\end{tblr}
\end{table} 
