Why is the color in the PDF different from the one defined in LaTex file?

Question

I've found this template to insert Python code in which the background color is very ease to my eyes:

\documentclass[12pt]{article}
\usepackage[left = 1in, right = 1in, top = 1in, bottom = 1in]{geometry}
\usepackage[most]{tcolorbox}
\usepackage{listings}

\begin{document}

% Define colors to be used in the code 
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{darkraspberry}{rgb}{0.53, 0.15, 0.34}
\definecolor{backcolour}{rgb}{0.95, 0.95, 0.96}
\definecolor{airforceblue}{rgb}{0.36, 0.54, 0.66}

% Define the style of the code 
\lstdefinestyle{codeStyle}{
backgroundcolor=\color{backcolour},   
  commentstyle=\color{codegreen},
  keywordstyle=\color{airforceblue},
  numberstyle=\tiny\color{codegray},
  stringstyle=\color{darkraspberry},
  basicstyle=\ttfamily\footnotesize,
  breakatwhitespace=false,         
  breaklines=true,                 
  captionpos=b,                    
  keepspaces=true,                 
  numbers=left,                    
  numbersep=5pt,                  
  showspaces=false,                
  showstringspaces=false,
  showtabs=false,                  
  tabsize=2
}

% Set the style of the code to be our defined style
\lstset{style = codeStyle}

% Create the code listing
\lstinputlisting[language=Python]{Question 2d.py}

\end{document}

Here is my Python file (.py) used in the code.

From \definecolor{backcolour}{rgb}{0.95, 0.95, 0.96}, I guess the RGB is 0.95, 0.95, 0.96. But this color is different than what I observed in the PDF.

My desired color (from the background of the code) is a little bit darker than the color {rgb}{0.95, 0.95, 0.96}.

Could you please help me figure out why there is such difference and how to obtain my desired color?