Update cart-builder.html

Author: Shen-wb

barcode-scanner-api-samples/scan-multiple-barcodes/cart-builder.html

@@ -70,12 +70,14 @@
 
     #floatingDiv {
       position: fixed;
-      top: 400px;
-      left: 100px;
+      top: 40%;
+      left: 10%;
       width: 50%;
       height: 25%;
       max-width: 400px;
       max-height: 200px;
+      min-width: 150px;
+      min-height: 150px;
       background: #f9f9f9;
       border: 2px solid #ccc;
       border-radius: 8px;