\documentclass[color,cover]{fithesis3/fithesis3}
\usepackage[english]{babel}
\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 & $11^{\circ}\mathrm{C}$ & $22^\circ$C & A clear day
    with lots of sunshine. However, the strong breeze will bring
    down the temperatures. \\
    Tuesday & $9^{\circ}\mathrm{C}$ & $19^\circ$C & Cloudy with
    rain, across many northern regions. Clear spells across most of
    Scotland and Northern Ireland, but rain reaching the far
    northwest. \\
    Wednesday & $10^{\circ}\mathrm{C}$ & $21^\circ$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}
