config.tex

\PassOptionsToPackage{style=arsclassica, eulerchapternumbers, dottedtoc, pdfspacing, floatperchapter, beramono}{classicthesis} 

\PassOptionsToPackage{T1}{fontenc}
\usepackage{fontenc}

\PassOptionsToPackage{backend=biber, style=alphabetic}{biblatex} % You can change the bibliography style here.
\usepackage{biblatex}
\addbibresource{Bibliography.bib}

\usepackage{graphicx} 
    \graphicspath{{Images/}} % Set images as the default path.
    
\usepackage{amssymb, amsthm, mathtools} % If you don't plan to write any maths, just remove this line.

\usepackage{epigraph} % If you don't want to add quotes at the beginning of the chapters, just remove this line.

% Conditional to check if on Overleaf. 
\newif\ifoverleaf
\IfFileExists{output.log}{\overleaftrue}{\overleaffalse}

% If you don't need to write any code, just remove these lines.
\ifoverleaf
  \usepackage[outputdir=../]{minted}
\else
  \usepackage{minted}
\fi

\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}

\theoremstyle{definition}
\newtheorem{postulate}{Postulate}
\newtheorem{defn}{Definition}[chapter]

\theoremstyle{plain}
\newtheorem{theorem}{Theorem}[chapter]

\usepackage{frontespizio, classicthesis}