function affiche_menu() {
    let menu = document.getElementById("menu")
    if (menu.style.display == "block")  {
        menu.style.display = "none"
    } else {
        menu.style.display = "block"
    }
}

let titreMenu = document.getElementById("titreMenu")
titreMenu.addEventListener("click", affiche_menu)

function preview() {
    let prev = document.getElementById("preview")
    prev.style.width = "200px"
}

let prev = document.getElementById("preview")
prev.addEventListener("click", preview)