\documentclass[english,10pt]{beamer}
\usetheme{JuanLesPins}
\setbeamercovered{transparent}
\definecolor{vertmoyen}{rgb}{0.20,0.43,0.09}
\usecolortheme[named=vertmoyen]{structure}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\setbeamersize{text margin left = 5mm,text margin right = 5mm}
%\usepackage{color}
%\usepackage{xcolor}
%\usepackage{pgf}
\usepackage{tikz}
%\usepackage{graphicx}
%\usepackage{picins}
%\DeclareGraphicsExtensions{.jpg,.pdf,.png}
%\usepackage{amssymb}
%\usepackage{amsmath}
%\usepackage{amsfonts}
%\usepackage{url}
%\usepackage{setspace}
\usepackage{gensymb}
\usepackage{mathrsfs}
\usepackage{chemfig}
\usepackage{pgfplots}
\usepackage{siunitx}
\usepackage{booktabs}
\usepackage{tabularx}
\usepackage{array}
\usepackage{ragged2e, makecell, mhchem}
%\usepackage{fancyhdr}
%\pagestyle{fancy}
%\pagestyle{empty}
\setbeamertemplate{headline}{}
\setbeamertemplate{footline}{}
\title{Mon titre}