button toggling works

src/public/javascript/offers.js

@@ -22,3 +22,19 @@ buttonStartCreateOffer.addEventListener('click', () => {
 closeOfferControls.addEventListener('click', () => {
   toggleCreateOfferControls();
 });
+
+function toggleBuyOrSellButtonGroup() {
+  buyOrSellButtons.forEach((button) => {
+    if (button.classList.contains('selected')) {
+      button.classList.remove('selected');
+    } else {
+      button.classList.add('selected');
+    }
+  });
+}
+
+buyOrSellButtons.forEach((button) => {
+  button.addEventListener('click', () => {
+    toggleBuyOrSellButtonGroup();
+  });
+});