Ho ripreso la cosa:
`\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage{microtype}
\usepackage{tgbonum}
\usepackage{tgadventor}
\usepackage{tgcursor}
\sbox0{\fontsize{1}{1}\ttfamily x} % \texttt grassetto di default
\DeclareFontShape{T1}{qcr}{m}{n}{<->ssub*qcr/b/n}{}
\DeclareFontShape{T1}{qcr}{m}{it}{<->ssub*qcr/b/it}{}
\usepackage{titlesec}
\usepackage[top=3cm,bottom=4cm,left=4cm,right=3cm,heightrounded]{geometry}
\frenchspacing
\usepackage[table,dvipsnames]{xcolor}
\definecolor{spot}{rgb}{0.6,0,0}
\frenchspacing
\usepackage[pdftex]{graphicx}
\usepackage{url}
\titleformat{\section}[hang]{\normalfont\Large\bfseries\color%
{spot}}{\makebox[2cm][r]{\thesection}}{.5cm}{}
\titlespacing*{\section}{-2.5cm}{3.5ex plus 1ex minus .2ex}{2.3ex plus .2ex}
\titleformat{\subsection}[hang]{\normalfont\large\itshape\color%
{spot}}{\makebox[2cm][r]{\thesubsection}}{.5cm}{}
\titlespacing*{\subsection}{-2.5cm}{3.25ex plus 1ex minus .2ex}{1.5ex plus.2ex}
\usepackage{hyperref}
\hypersetup{pdfborder=0 0 0,colorlinks,citecolor=black,filecolor=black,%
linkcolor=black,linktocpage,urlcolor=black,bookmarksopen,hyperindex,%
pdftitle={Istruzioni per navigare correttamente in rete},pdfauthor={Liceo
“Franchetti” – Mestre}}
\usepackage{bookmark}
\usepackage{titling}
\pretitle{\vspace*{-2cm}\begin{center}
\valign{\vfill\hbox{##}\vfill\cr
\llap{\includegraphics[width=1.8cm]{logo}\hspace{1.5cm}}\cr
\begin{tabular}{@{}c@{}}
\bfseries LICEO GINNASIO STATALE \\
\bfseries «RAIMONDO FRANCHETTI» — VENEZIA-MESTRE \\
Corso del Popolo, 82 VE-MESTRE 30172 \\
{\small Tel. 041/5315531 — Fax 041/5328524} \\
{\small e-mail: segreteria@liceofranchetti.it} \\
{\small Cod. fiscale 82007660275 — Cod. Scuola VEPC04000L}
\end{tabular}\cr}\par
\vspace{1.5cm}
\fontsize{24}{46}\selectfont \bfseries\color{spot}}
\posttitle{\par\end{center}}
\preauthor{\begin{center}\huge\itshape\color{spot}}
\postauthor{\end{center}}
\title{Internet. Istruzioni per l'uso}
\author{Come navigare correttamente da scuola}
\date{}
\begin{document}
\maketitle
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\begin{document}
%
\begin{minipage}[t]{\textwidth}
\begin{center}
\valign{\vfill\hbox{#}\vfill\cr
\llap{\includegraphics[width=1.8cm]{logo}\hspace{1.5cm}}\cr
\begin{tabular}{@{}c@{}}
\bfseries LICEO GINNASIO STATALE \\
\bfseries «RAIMONDO FRANCHETTI» — VENEZIA-MESTRE \\
Corso del Popolo, 82 VE-MESTRE 30172 \\
{\small Tel. 041/5315531 — Fax 041/5328524} \\
{\small e-mail: segreteria@liceofranchetti.it} \\
{\small Cod. fiscale 82007660275 — Cod. Scuola VEPC04000L}
\end{tabular}\cr}\par
\vspace{1.5cm}
\fontsize{24}{46}\selectfont \bfseries\color{spot}{Internet. Istruzioni per l'uso}\par
\normalfont\huge\itshape\color{spot} Come navigare correttamente da scuola\par
\end{center}
\end{minipage}
\end{document}`
La minipage è spostata a destra: come mai?
Inoltre credo che la formattazione dei titoli
nella minipage sia fatta male (l’ultimo \par
non credo serva a niente, ad esempio)
M