function menu_button_onclick() {
    const menu_areas = document.getElementsByClassName("menu_area");
    const menu_childs = menu_areas[0].children;
    if (menu_areas[0].style.overflow !== "visible") {
        menu_areas[0].style.height = "auto";
        menu_areas[0].style.overflow = "visible";
    } else {
        menu_areas[0].style.height = "60px";
        menu_areas[0].style.overflow = "hidden";
    }
}