\documentclass[a4paper,12pt,oneside]{book}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage[polish]{babel}
\usepackage[style=croatian]{csquotes}
\usepackage{color}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage{epstopdf}
\usepackage{url}
\usepackage{amsmath}
\usepackage[ocgcolorlinks]{hyperref}
\usepackage{lmodern}