\documentclass[table,color,cover]{fithesis/fithesis3}
\usepackage{polyglossia}
\setmainlanguage{english}
\usepackage{amsmath}
\usepackage{tabularx}
\usepackage{booktabs}
\thesissetup{faculty=fi}
\begin{document}
  \chapter{Foo bar}
  Hello world!
  \begin{equation}
    \tag{Mass--energy equivalence} e=mc^2
  \end{equation}
  \begin{center}
    \begin{tabularx}{\textwidth}{lllX}
    \toprule
    Day & Min Temp & Max Temp & Summary \\
    \midrule
    Monday & $11^{\circ}\mathrm{C}$ & $22^\circ\mathrm{C}$ & A
    clear day with lots of sunshine. However, the strong breeze
    will bring down the temperatures. \\
    Tuesday & $9^{\circ}\mathrm{C}$ & $19^\circ\mathrm{C}$ & Cloudy
    with rain, across many northern regions. Clear spells across
    most of Scotland and Northern Ireland, but rain reaching the
    far northwest. \\
    Wednesday & $10^{\circ}\mathrm{C}$ &
    $21^\circ\mathrm{C}$ & Rain will still linger for the morning.
    Conditions will improve by early afternoon and continue
    throughout the evening.\\
    \bottomrule
    \end{tabularx}
  \end{center}
\end{document}
