minor style changes for increment and decrement buttons on firefox number fields

common/static/css/vendor/html5-input-polyfills/number-polyfill.css

@@ -2,9 +2,8 @@
 div.number-spin-btn-container {
   display: inline-block;
   position: relative;
-  vertical-align: top;
-  margin: 0;
-  margin-left: 3px;
+  vertical-align: middle;
+  margin: 0 0 0 3px;
   padding: 0; }
 
 div.number-spin-btn {

common/static/js/vendor/html5-input-polyfills/number-polyfill.js

@@ -142,7 +142,7 @@ HTML5 Number polyfill | Jonathan Stipe | https://github.com/jonstipe/number-poly
           var $downBtn, $elem, $upBtn, attrMutationCallback, attrObserver, btnContainer, downBtn, elem, halfHeight, upBtn;
           elem = this;
           $elem = $(elem);
-          halfHeight = ($elem.outerHeight() / 2) + 'px';
+          halfHeight = ($elem.outerHeight() / 5) + 'px';
           upBtn = document.createElement('div');
           downBtn = document.createElement('div');
           $upBtn = $(upBtn);