diff --git a/sundog-dog-food-calculator.js b/sundog-dog-food-calculator.js
index eb812ce..d3056b4 100644
--- a/sundog-dog-food-calculator.js
+++ b/sundog-dog-food-calculator.js
@@ -1674,6 +1674,11 @@
             color: white;
         }
 
+        /* Hidden unit select for compatibility */
+        .dog-calculator-unit-select-hidden {
+            display: none;
+        }
+
         /* Mobile responsive adjustments for inline unit selector */
         @media (max-width: 576px) {
             .dog-calculator-result-item {
@@ -1968,7 +1973,7 @@
                     </div>
 
                     <!-- Hidden select for compatibility -->
-                    <select id="unit" style="display: none;" aria-describedby="unitHelp">
+                    <select id="unit" class="dog-calculator-unit-select-hidden" aria-describedby="unitHelp">
                         <option value="g">grams (g)</option>
                         <option value="kg">kilograms (kg)</option>
                         <option value="oz">ounces (oz)</option>