I am trying to add a list of elements into a `longtable` cell.  

I have tried several solutions and the only one that has proved really applicable is the one I present in the following *MWE*.  

The main problem is that I want to colour the table (with alternating rows) with the colour I have defined, called `lightblue`.  

Here's the example:

```tex
\documentclass[a4paper]{article}
\usepackage[table]{xcolor}
\usepackage{longtable}
\usepackage{makecell}

\definecolor{lightblue}{rgb}{0.93,0.95,1.0}

\begin{document}

\subsection{Tracciamento} \label{subsec:tracciamento}
\rowcolors{1}{lightblue}{white}
    \begin{longtable}[c]{|c|c|}
        \hline
            \textbf{Fonte} &
            \textbf{Requisiti} \\
        \hline
            Capitolato & \makecell[t]{RF02\\RFD3\\RFD4} \\
        \hline
            Interno & \makecell[t]{RQO1\\RQO2\\RQD8} \\
        \hline
            UC 1 &
            RF01 \\
        \hline
            UC 2 &
            RF01.1 \\
        \hline
        \caption{Tracciamento fonte - requisiti} \label{tab:fonte_requisiti}
    \end{longtable}
\end{document}

```

and this is the output after the compilation:  

[![enter image description here](https://i.stack.imgur.com/3hzaz.png)](https://i.stack.imgur.com/3hzaz.png)

Now, the problem lies in the fact that the colour does not seem to work properly.  

I thank anyone who can help me solve this problem!