The following code was used and compiled with pdfLaTeX on a updated version of TeX Live 2022.

\documentclass[preview, border={-10mm 2mm}]{standalone}

\usepackage{fixdif}

\newcommand{\iu}{\mathrm{i}\mkern1mu}

\begin{document}
    \begin{centering}
    Computer Modern\\
    \vspace{5pt}
    The quick brown fox jumped over the lazy dog.\\
    Some numbers: 1234567890
    \[\hat{f}(\xi) = \int_{-\infty}^{+\infty} f(x) \exp(-2 \pi \iu \xi x) \d x\]\\
    \end{centering}
\end{document}