No spinners on number field

src/app.css

@@ -24,3 +24,13 @@
 .read-the-docs {
   color: #888;
 }
+
+.no-arrows::-webkit-outer-spin-button,
+.no-arrows::-webkit-inner-spin-button {
+    -webkit-appearance: none;
+    margin: 0;
+}
+
+.no-arrows {
+    -moz-appearance: textfield;
+}