Update style.css

style.css

@@ -135,15 +135,15 @@ button:disabled {
   color: #1c6fa2;
 }
 
-/* รถเข็น sticky ใน .container */
+/* รถเข็น ลอยขวาบน fixed */
 #cart-icon-box {
-  position: sticky;
-  top: 8px;
-  right: 0;
-  z-index: 10;
+  position: fixed;
+  top: 18px;
+  right: 16px;
+  z-index: 99;
   background: #f5f9fc;
   border-radius: 12px;
-  padding: 4px 14px;
+  padding: 6px 16px;
   box-shadow: 0 2px 6px #b2c7e622;
   min-width: 56px;
   border: 1px solid #dde7f3;
@@ -151,7 +151,7 @@ button:disabled {
   display: flex;
   align-items: center;
   gap: 0.3em;
-  margin-left: auto;
+  transition: background 0.15s;
 }
 #cart-icon-box:hover {
   background: #d7edff;
@@ -226,6 +226,6 @@ html, body {
     max-width: 97vw;
     padding: 8px;
   }
-  #cart-icon-box { top: 6px; }
+  #cart-icon-box { right: 6px; top: 6px; padding: 5px 12px; }
   .section { margin-bottom: 0.7em; }
 }