diff --git a/customer-display.php b/customer-display.php
index cd7aad6..60fd9a0 100644
--- a/customer-display.php
+++ b/customer-display.php
@@ -62,16 +62,16 @@
             box-shadow: 0 1px 2px rgba(0,0,0,0.05);
         }
         .item-name {
-            font-size: 1.2rem;
+            font-size: 2.5vmin;
             font-weight: 600;
             color: var(--text);
         }
         .item-details {
             color: var(--text-muted);
-            font-size: 0.9rem;
+            font-size: 2vmin;
         }
         .item-price {
-            font-size: 1.2rem;
+            font-size: 2.5vmin;
             font-weight: bold;
             color: var(--accent);
         }
@@ -79,7 +79,7 @@
             display: flex;
             justify-content: space-between;
             margin-bottom: 1rem;
-            font-size: 1.2rem;
+            font-size: 2.5vmin;
             color: var(--text-muted);
         }
         .grand-total {
@@ -92,12 +92,12 @@
             box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
         }
         .grand-total-label {
-            font-size: 1.2rem;
+            font-size: 3vmin;
             text-transform: uppercase;
             opacity: 0.9;
         }
         .grand-total-amount {
-            font-size: 3.5rem;
+            font-size: 10vmin;
             font-weight: 800;
             line-height: 1.2;
         }
@@ -111,7 +111,7 @@
             color: var(--text-muted);
         }
         .welcome-icon {
-            font-size: 5rem;
+            font-size: 15vmin;
             margin-bottom: 1rem;
             color: var(--border);
             opacity: 0.5;
@@ -138,6 +138,7 @@
             <i class="bi bi-cart4 me-2"></i>Customer Display
         </div>
         <div class="d-flex align-items-center">
+            <button onclick="toggleFullScreen()" class="btn btn-sm btn-link text-muted me-3" title="Toggle Fullscreen"><i class="bi bi-arrows-fullscreen"></i></button>
             <div id="debugInfo" class="me-3 badge bg-secondary" style="display: none;">Items: 0</div>
             <div id="customerName" class="badge bg-light text-dark fs-6 fw-normal border">
                 Welcome
@@ -318,6 +319,24 @@
                 updateDisplay(JSON.parse(stored));
             } catch (e) {}
         }
+
+        function toggleFullScreen() {
+            if (!document.fullscreenElement) {
+                document.documentElement.requestFullscreen();
+            } else {
+                if (document.exitFullscreen) {
+                    document.exitFullscreen();
+                }
+            }
+        }
+
+        // Attempt to maximize on load
+        window.addEventListener('load', () => {
+             try {
+                 window.moveTo(0, 0);
+                 window.resizeTo(screen.availWidth, screen.availHeight);
+             } catch(e) {}
+        });
     </script>
 </body>
 </html>
diff --git a/index.php b/index.php
index bf516fa..cbce7a2 100644
--- a/index.php
+++ b/index.php
@@ -2868,7 +2868,7 @@ $projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? 'Accounting System';
             <div class="p-3 border-bottom d-flex justify-content-between align-items-center">
                 <h6 class="m-0 fw-bold"><i class="bi bi-cart3 me-2"></i>Cart</h6>
                 <div class="d-flex gap-2">
-                    <button class="btn btn-sm btn-outline-info" onclick="window.open('customer-display.php?v=<?= time() ?>', 'CustomerDisplay', 'width=1000,height=800')" title="Customer Display"><i class="bi bi-display me-1"></i> Customer Screen</button>
+                    <button class="btn btn-sm btn-outline-info" onclick="window.open('customer-display.php?v=<?= time() ?>', 'CustomerDisplay', 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=' + screen.availWidth + ',height=' + screen.availHeight + ',left=0,top=0')" title="Customer Display"><i class="bi bi-display me-1"></i> Customer Screen</button>
                     <button class="btn btn-sm btn-outline-warning" onclick="cart.openHeldCartsModal()" title="Held List"><i class="bi bi-list-task"></i></button>
                     <button class="btn btn-sm btn-outline-secondary" onclick="cart.hold()" title="Hold Cart"><i class="bi bi-pause-circle"></i></button>
                     <button class="btn btn-sm btn-outline-danger" onclick="cart.clear()" title="Clear Cart"><i class="bi bi-trash"></i></button>