Color and style conflicts in table

Question

So, I have a very simple table I'm trying to get working. The idea is to have the first, second, and last column/row separators be thick and colored a shade of green, while the first column and first row are given a background of pale yellow. At the same time I still need normal column/row separators.

However, my initial attempts to achieve this result have been met with what I believe to be multiple small issues. To list them, the most major issue is that the first and second column separators extend below the bottom of the table. Second, the normal \hline is drawing over the vertical rules, when I would prefer the latter. Third, changing the cell color draws over parts of the separators, making them appear thinner in certain places. Fourth, the normal vertical rules don't display consistently when bordered by colored cells.

Here is my minimal working example. I used the xcolor package to help define the colors and colortbl to add colors to the \hrule in the newcommands and color to the \newcolumntypes.

\documentclass[10pt]{article}
\usepackage{xcolor}
\usepackage{colortbl}

\definecolor{forestgreen}{RGB}{  39, 159,  39}
\definecolor{paleyellow}{RGB}{ 255, 255, 212}

\newcommand{\ywl}{\cellcolor{paleyellow}}
\newcommand{\grline}{\noalign{\color{forestgreen}\hrule height 1.6pt}}
\newcolumntype{(}{@{\color{forestgreen}\vrule width 1.6pt\hskip\tabcolsep}}
\newcolumntype{"}{@{\hskip\tabcolsep\color{forestgreen}\vrule width 1.6pt\hskip\tabcolsep}}
\newcolumntype{)}{@{\hskip\tabcolsep\color{forestgreen}\vrule width 1.6pt}}

\begin{document}

\begin{tabular}{(c"c|c|c|c)}
\grline
\ywl &\ywl 0 &\ywl a &\ywl b &\ywl c \\
\grline
\ywl 0 & 0 & 0 & 0 & 0 \\
\hline
\ywl a & 0 & a & b & c \\
\hline
\ywl b & 0 & 0 & 0 & 0 \\
\hline
\ywl c & 0 & a & b & c \\
\grline
\end{tabular}

\end{document}

Answer 1

Here is a version using a tikz matrix:

Since you only wrote about \hline and the colored vertical lines, please keep in mind that with the below code, all colored lines are drawn on top of the black lines. This applies to the vertical colored line that is drawn on top of the cossing black hlines but also applies to the horizontal colored line.

\documentclass{article}
\usepackage{xcolor}
\definecolor{forestgreen}{RGB}{  39, 159,  39}
\definecolor{paleyellow}{RGB}{ 255, 255, 212}

\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}

\begin{tikzpicture}[cell/.style={rectangle,draw=black}, nodes in empty cells]
  \matrix(table)[
  matrix of nodes,
  row sep =-\pgflinewidth,
  column sep = -\pgflinewidth,
  nodes={anchor=center,text height=2ex,text depth=0.25ex, minimum width=2em, draw=black},
  column 1/.style = {nodes={fill=paleyellow}},
  row 1/.style={nodes={fill=paleyellow}},
  ] 
  {
 & 0 & a & b & c \\
 0 & 0 & 0 & 0 & 0 \\
 a & 0 & a & b & c \\
 b & 0 & 0 & 0 & 0 \\
 c & 0 & a & b & c \\
  };
  \draw[line width=1.6pt, forestgreen](table-1-1.north west)--(table-1-5.north east) -- (table-5-5.south east) -- (table-5-1.south west) -- cycle;
  \draw[line width=1.6pt, forestgreen](table-1-1.north east)--(table-5-1.south east) ;
  \draw[line width=1.6pt, forestgreen](table-1-1.south west)--(table-1-5.south east) ;
\end{tikzpicture}

\end{document}

---

Update with \mymatcols and \mymatrows from here: With the before mentioned commands, the maximum number of columns and rows in that matrix it determined automatically. Upon changing the number of columns/rows in the matrix, the green colored lines are automatically adjusted as well.

\documentclass{article}
\usepackage{xcolor}
\definecolor{forestgreen}{RGB}{  39, 159,  39}
\definecolor{paleyellow}{RGB}{ 255, 255, 212}

\usepackage{tikz}
\usetikzlibrary{matrix}

\makeatletter
\tikzset{store number of columns in/.style={execute at end matrix={
\xdef#1{\the\pgf@matrix@numberofcolumns}}},
store number of rows in/.style={execute at end matrix={
\xdef#1{\the\pgfmatrixcurrentrow}}}}
\makeatother

\begin{document}

\begin{tikzpicture}[cell/.style={rectangle,draw=black}, nodes in empty cells]
  \matrix(table)[
  matrix of nodes,
  row sep =-\pgflinewidth,
  column sep = -\pgflinewidth,
  nodes={anchor=center,text height=2ex,text depth=0.25ex, minimum width=2em, draw=black},
  column 1/.style = {nodes={fill=paleyellow}},
  row 1/.style={nodes={fill=paleyellow}},
  store number of columns in=\mymatcols,
  store number of rows in=\mymatrows
  ] 
  {
 & 0 & a & b & c \\
 0 & 0 & 0 & 0 & 0 \\
 a & 0 & a & b & c \\
 b & 0 & 0 & 0 & 0 \\
 c & 0 & a & b & c \\
  };
  \draw[line width=1.6pt, forestgreen](table-1-1.north west)--(table-1-\mymatcols.north east) -- (table-\mymatcols-\mymatrows.south east) -- (table-\mymatrows-1.south west) -- cycle;
  \draw[line width=1.6pt, forestgreen](table-1-1.north east)--(table-\mymatrows-1.south east) ;
  \draw[line width=1.6pt, forestgreen](table-1-1.south west)--(table-1-\mymatcols.south east) ;
\end{tikzpicture}

\end{document}

Answer 2

For coloring the column separators

\documentclass{article}

\usepackage{hhline,colortbl}

\begin{document}
\arrayrulecolor{green}
\arrayrulewidth=2mm
\begin{tabular}{
 !{\color{red}\vrule width 2pt}
 l
 |
 c
 !{\color{blue}\vrule width 2pt}
 c
 ||
}
 one & two & three\\
\hline
  1 & 2 & 3\\%
\noalign{
\color{yellow}
\hrule height 5pt
}%
4&5&6\\
\hline
\end{tabular}
\end{document}

For coloring the cells/content

\documentclass{article}
\usepackage[svgnames,table]{xcolor}% note the table option
\usepackage{booktabs}
\renewcommand{\arraystretch}{2}
\makeatletter
\newcommand*{\minuscellcolor}{}
\def\minuscellcolor\ignorespaces{%
  % \ignorespaces not really needed, because \@ifnextchar gobbles spaces
  \@ifnextchar{T}{\cellcolor{green!40}}{}%
}
\newcolumntype{C}{>{\minuscellcolor}c}
\makeatother

\begin{document}
\begin{center}

 \begin{tabular}{*{8}C}                    \toprule\rowcolor{gray!30}
 p & q & p & $\vee$ & [$\neg$ & (p & $\wedge$ & q)]      \\ 
 T & T & T & T & F & T & T & T                           \\ 
 T & F & T & T & T & T & F & F                           \\
 F & T & F & T & T & F & F & T                           \\
 F & F & F & T & T & F & F & F                           \\ \bottomrule
\end{tabular}

\end{center}
\end{document}

Answer 3

Here is what you can do with {NiceTabular} of nicematrix.

The key hvlines of {NiceTabular} draws all the rules (in black).

Then, I use Tikz to draw the green rules by using the PGF/Tiks nodes created by nicematrix under the cells, rows and columns.

The code is independant of the number of rows and columns in the tabular.

\documentclass[10pt]{article}
\usepackage{xcolor}
\usepackage{nicematrix,tikz}

\definecolor{forestgreen}{RGB}{  39, 159,  39}
\definecolor{paleyellow}{RGB}{ 255, 255, 212}

\begin{document}

\begin{NiceTabular}{ccccc}[hvlines]
\CodeBefore
  \rowcolor{paleyellow}{1}
  \columncolor{paleyellow}{1}
\Body
   &  0 & a & b & c \\
  0 & 0 & 0 & 0 & 0 \\
  a & 0 & a & b & c \\
  b & 0 & 0 & 0 & 0 \\
  c & 0 & a & b & c \\
\CodeAfter
  \tikz [forestgreen, line width = 1pt]
    \draw (1-|1) rectangle (last-|last) 
          (1-|2) -- (last-|2) 
          (2-|1) -- (2-|last) ; 
\end{NiceTabular}

\end{document}

You need several compilations (because of the PGF/Tikz nodes)