Update settings.html

settings.html

@@ -9,7 +9,15 @@
 
 
 <style>
+input[type="number"]::-webkit-inner-spin-button, 
+input[type="number"]::-webkit-outer-spin-button {
+  -webkit-appearance: inner-spin-button;
+  opacity: 1;
+}
 
+input[type="number"] {
+  -moz-appearance: textfield;
+}
 
 </style>