tikz-header.tex

\documentclass{standalone}

\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX}  % -- becomes en-dash etc.
\setmonofont{Fira Mono}[Scale=MatchLowercase]

\usepackage{tikz}
\usetikzlibrary{
  calc,
  patterns,
  quotes,
  tikzmark,
  angles,
  decorations.markings,
  decorations.pathmorphing,
  decorations.pathreplacing,
  fadings,
  shapes,
  positioning
}
\tikzset{fontscale/.style = {font=\relsize{#1}}}
\usepackage{pgfplots}
\usepackage{tikz-feynman}

% math
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathtools}
\usepackage{xfrac}


\usepackage[
  mathrm=sym,        % use math font for mathrm, not text font
  math-style=ISO,
  bold-style=ISO,
  sans-style=italic,
  nabla=upright,
  partial=upright,
  warnings-off={
    mathtools-colon,
    mathtools-overbracket,
  },
]{unicode-math}

\usepackage[
  separate-uncertainty=true,
  per-mode=symbol-or-fraction,
]{siunitx}
\sisetup{math-micro=\text{µ},text-micro=µ}

\usepackage{mhchem}

% new commands
\newcommand{\code}[2]{%
  \texttt{\textcolor{#1}{\detokenize{#2}}}%
}


\newcommand{\ubeta}{\symup{\beta}}
\newcommand{\ugamma}{\symup{\gamma}}


\usepackage{xcolor}

% define your colors here
\xdefinecolor{tugreen}{RGB}{132, 184, 25}
\xdefinecolor{tulightgreen}{HTML}{99b560}
\xdefinecolor{darkmode}{HTML}{3a3d41}
\colorlet{tulight}{tugreen!20!white}
\colorlet{tudark}{tugreen!80!black}

\xdefinecolor{tuorange}{RGB}{227, 105, 19}
\xdefinecolor{tuyellow}{RGB}{242, 189, 0}
\xdefinecolor{tucitron}{RGB}{249, 219, 0}

\xdefinecolor{tublue}{RGB}{25, 132, 184}
\colorlet{tublight}{tublue!20!white}
\colorlet{tubdark}{tublue!60!black}

\colorlet{lightgray}{darkgray!70!white}
\colorlet{lightergray}{darkgray!50!white}