网页设计弹出信息代码

: CSS: .popup { display: none; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); padding: 20px; background-color: #ffffff; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); } JavaScript: function openPopup() { document.getElementById("popup").style.display = "block"; } function closePopup() { document.getElementById("popup").style.display = "none"; }