\begin
Discover why 18 million people worldwide trust Overleaf with their work.
\documentclass[letterpaper,12pt]{report}
\usepackage[spanish,es-lcroman]{babel} %español pero con números romanos en minúscula
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{float}
\usepackage{pdfpages}
\usepackage{blindtext}
\usepackage{lmodern}
\usepackage{kpfonts}
\usepackage{multicol}
\usepackage{wrapfig}
\usepackage{fancyhdr}
\usepackage{array}
\usepackage[hidelinks]{hyperref}
\usepackage{fontspec}
\usepackage{setspace}
\usepackage[version=4]{mhchem}
\usepackage{subcaption}
\usepackage{titlesec}
\usepackage[authoryear]{natbib}
\setcitestyle{text}
\usepackage{color}
\usepackage{listings}
\usepackage{xcolor}
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
\lstdefinestyle{mystyle}{
backgroundcolor=\color{backcolour},
commentstyle=\color{codegreen},
keywordstyle=\color{magenta},
numberstyle=\tiny\color{codegray},
stringstyle=\color{codepurple},
basicstyle=\ttfamily\footnotesize,
breakatwhitespace=false,
breaklines=true,
captionpos=b,
keepspaces=false,
numbers=left,
numbersep=5pt,
showspaces=false,
showstringspaces=false,
showtabs=false,
tabsize=2,
frame=single
}
\lstset{style=mystyle}
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge}
\titlespacing*{\chapter}{0pt}{-50pt}{40pt}
\setmainfont{Arial}
\numberwithin{equation}{section}
\usepackage[left=4cm,right=2.5cm,top=4cm,bottom=2.5cm]{geometry}
\spanishdecimal{.}
\setlength{\parindent}{0cm}
\setlength{\parskip}{12pt}
\captionsetup[figure]{font=footnotesize,labelfont=footnotesize}
\captionsetup[table]{font=footnotesize,labelfont=footnotesize}
\renewcommand{\baselinestretch}{1.5}
\renewcommand{\contentsname}{TABLA DE CONTENIDO}
\renewcommand{\listtablename}{ÍNDICE DE TABLAS}
\renewcommand{\listfigurename}{ÍNDICE DE ILUSTRACIONES}
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\begin{document}
\include{Portada.tex}
\clearpage
\pagenumbering{roman}
\pagestyle{fancy}
\fancyhf{}
\fancyfoot[R]{\thepage}
\renewcommand{\headrulewidth}{0pt}
\fancypagestyle{plain}{%
\fancyhf{} % clear all header and footer fields
\fancyfoot[R]{\thepage}
\renewcommand{\headrulewidth}{0pt}}
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\setlength{\parskip}{0pt}
\include{Derechos_de_autor}
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\setlength{\parskip}{12pt}
\include{Página_de_calificación}
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\include{Dedicatoria.tex}
\include{Agradecimientos.tex}
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\pagestyle{empty}
\setlength{\parskip}{0pt}
\include{Tabla_de_contenido.tex}
\include{Índice_de_tablas.tex}
\include{Índice_de_ilustraciones.tex}
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\setlength{\parskip}{12pt}
\pagestyle{fancy}
\include{Resumen.tex}
\include{Abstract.tex}
\pagestyle{empty}
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\pagestyle{fancy}
\pagenumbering{arabic}
\setlength{\parindent}{0.6cm}
\setlength{\parskip}{12pt}
\renewcommand{\tablename}{Tabla}
\include{Introducción.tex}
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\include{Antecedentes_generales.tex}
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\include{Resultados.tex}
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\include{Conclusiones.tex}
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\setlength{\parskip}{24pt}
\include{Bibliografía.tex}
\include{Apéndice.tex}
\end{document}