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.change-button { background-color: #ffff; color: black; border: none; padding: 6px 10px; border-radius: 4px; text-align: center; text-decoration: none; display: inline-block; font-size: 14px; transition: background-color 0.3s; cursor: pointer; } .change-button.changed { background-color: #fffff; } document.addEventListener("DOMContentLoaded", function () { var button = document.getElementById("changeButton"); button.addEventListener("click", function () { button.classList.toggle("changed"); button.textContent = button.classList.contains("changed") ? "+33 7 55 52 11 50" : "Appelez-nous"; }); });