Fix tabs wrapping

src/navbar.css

@@ -16,6 +16,13 @@
     font-family: "Helvetica";
 }
 
+@media screen and (max-width: 960px) {
+    .navbar {
+        display: grid;
+        grid-template-columns: 1fr 1fr 1fr 1fr;
+    }
+}
+
 /* Change the color of links on hover */
 .navbar div:hover {
     background-color: #ddd;