diff --git a/dog-food-calculator-widget.js b/dog-food-calculator-widget.js
index dbf27e3..ed8c4d0 100644
--- a/dog-food-calculator-widget.js
+++ b/dog-food-calculator-widget.js
@@ -724,8 +724,14 @@
         .dog-calc-share-copy { background: #f19a5f; }
         .dog-calc-share-copy:hover { background: #e87741; transform: translateY(-1px); }
 
+        .dog-calc-share-url {
+            display: flex;
+            width: 100%;
+        }
+
         .dog-calc-share-url input {
             flex: 1;
+            width: 100%;
             padding: 10px 16px;
             border: 1px solid #e8e3ed;
             border-radius: 6px;
@@ -1301,6 +1307,7 @@
             const weightLabel = this.container.querySelector('#weightLabel');
             const weightInput = this.container.querySelector('#weight');
             const unitSelect = this.container.querySelector('#unit');
+            const energyUnitSelect = this.container.querySelector('#energyUnit');
 
             if (metricLabel && imperialLabel) {
                 metricLabel.classList.toggle('active', !this.isImperial);
@@ -1322,6 +1329,10 @@
                         <option value="kg">kilograms (kg)</option>
                     `;
                 }
+                // Set energy unit to kcal/cup for imperial
+                if (energyUnitSelect && energyUnitSelect.value === 'kcal100g') {
+                    energyUnitSelect.value = 'kcalcup';
+                }
             } else {
                 if (weightLabel) weightLabel.textContent = "Dog's Weight (kg):";
                 if (weightInput) {
@@ -1337,6 +1348,10 @@
                         <option value="lb">pounds (lb)</option>
                     `;
                 }
+                // Set energy unit to kcal/100g for metric
+                if (energyUnitSelect && energyUnitSelect.value === 'kcalcup') {
+                    energyUnitSelect.value = 'kcal100g';
+                }
             }
         }
 
diff --git a/iframe.html b/iframe.html
index 86a9a0f..56234f1 100644
--- a/iframe.html
+++ b/iframe.html
@@ -726,8 +726,14 @@
         .dog-calculator-share-copy { background: #f19a5f; }
         .dog-calculator-share-copy:hover { background: #e87741; transform: translateY(-1px); }
 
+        .dog-calculator-share-url {
+            display: flex;
+            width: 100%;
+        }
+
         .dog-calculator-share-url input {
             flex: 1;
+            width: 100%;
             padding: 10px 16px;
             border: 1px solid #e8e3ed;
             border-radius: 6px;
@@ -1243,6 +1249,7 @@
                 const weightLabel = document.getElementById('weightLabel');
                 const weightInput = document.getElementById('weight');
                 const unitSelect = document.getElementById('unit');
+                const energyUnitSelect = document.getElementById('energyUnit');
 
                 if (metricLabel && imperialLabel) {
                     metricLabel.classList.toggle('active', !this.isImperial);
@@ -1262,6 +1269,10 @@
                             '<option value="g">grams (g)</option>' +
                             '<option value="kg">kilograms (kg)</option>';
                     }
+                    // Set energy unit to kcal/cup for imperial
+                    if (energyUnitSelect && energyUnitSelect.value === 'kcal100g') {
+                        energyUnitSelect.value = 'kcalcup';
+                    }
                 } else {
                     if (weightLabel) weightLabel.textContent = "Dog's Weight (kg):";
                     if (weightInput) {
@@ -1275,6 +1286,10 @@
                             '<option value="oz">ounces (oz)</option>' +
                             '<option value="lb">pounds (lb)</option>';
                     }
+                    // Set energy unit to kcal/100g for metric
+                    if (energyUnitSelect && energyUnitSelect.value === 'kcalcup') {
+                        energyUnitSelect.value = 'kcal100g';
+                    }
                 }
             }