Ragazzi sto impazzendo. Non riesco a far funzionare neanche \parbox !!!
Questo è il preambolo
documentclass[a4paper, 12pt]{report}
\topmargin -1.5cm % read Lamport p.163
\oddsidemargin -0.08cm % read Lamport p.163
\evensidemargin -0.08cm % same as oddsidemargin but for left-hand pages
\textwidth 16.59cm
\textheight 21.94cm
\usepackage[italian]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[x11names]{xcolor}
\usepackage{rotating}
\usepackage{tikz}
\tikzstyle{mybox} = [draw=red!75!green, very thick, rectangle, rounded corners, fill=red!75!green, inner ysep=5pt, inner xsep=5pt]
\usepackage{kpfonts}
\usepackage[explicit]{titlesec}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{datetime}
\usepackage{enumerate}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{subfigure}
\usepackage{hyperref}
\usepackage{url}
\usepackage{eurosym}
\usepackage{xcolor}
\usepackage{multirow}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{%
\markboth{#1}{}}\makeatletter
\let\@orig@endthebibliography\endthebibliography
\renewcommand\endthebibliography{%
\xdef\@kept@last@number{\the\c@enumiv}%
\@orig@endthebibliography}
\newenvironment{thesitography}[1]
{\def\bibname{Siti Web consultati}%
\thebibliography{#1}%
\setcounter{enumiv}{\@kept@last@number}%
}
{\@orig@endthebibliography}\newcommand*\chapterlabel{}
\titleformat{\chapter}
{\gdef\chapterlabel{}
\normalfont\sffamily\Huge\bfseries\scshape}
{\gdef\chapterlabel{\thechapter\ }}{0pt}
{\begin{tikzpicture}[remember picture,overlay]
\node[yshift=-2cm] at (current page.north west)
{\begin{tikzpicture}[remember picture, overlay]
\draw[fill=red!75!green] (0,0) rectangle
(\paperwidth,3cm);
\node[anchor=east,xshift=.9\paperwidth,rectangle,
rounded corners=20pt,inner sep=11pt,
fill=white]
{\color{black}\chapterlabel#1};
\end{tikzpicture}
};
\end{tikzpicture}
}
\titlespacing*{\chapter}{0pt}{50pt}{-60pt}\usetikzlibrary{calc}
\usetikzlibrary{scopes}\makeatletter