I was trying a way to make a box for a certain part of my table like the following
Is there a way to create the red box?
My code so far for the table:
\begin{tabular}{cccc}
\toprule
& $x$ & $y$ & \\
\midrule
Β & 10 & 90 & \\
\textcolor{blue}{B'} & \textcolor{blue}{12} & \textcolor{blue}{y=?} & 2 \\
Γ & 20 & 70 & \\
\bottomrule
\end{tabular}%
\tikzmark
is the way to go,