Add a 3D pitch toggle, with raised terrain following it

public/css/style.css

@@ -1324,6 +1324,17 @@ html, body {
   user-select: none;
 }
 
+.pitch-toggle-ctrl__button {
+  width: 29px;
+  height: 29px;
+  font-size: 11px;
+  font-weight: 600;
+}
+
+.pitch-toggle-ctrl__button.active {
+  background: #dbe9ff;
+}
+
 .gpx-popup__header {
   display: flex;
   align-items: center;