function addCopyrightCurrentDate(){document.querySelector("footer").querySelector("p").innerHTML+=" "+(new Date).getFullYear()}function showActivityContent(e){e.target.parentElement.parentElement.querySelector(".headline").classList.toggle("toggle-visibility"),e.target.parentElement.parentElement.classList.toggle("slide")}addCopyrightCurrentDate(),document.querySelectorAll("section#activites button").forEach(function(e){e.addEventListener("click",showActivityContent)});