Prevent modal from being dragged on iOS devices

supply.html

@@ -461,8 +461,13 @@
             flex-direction: column;
             z-index: 1000;
             overflow: hidden;
-            /* 防止iOS滚动穿透 */
+            /* 防止iOS滚动穿透和模态框拖动 */
             touch-action: none;
+            /* 防止拖动 */
+            user-select: none;
+            -webkit-user-select: none;
+            -moz-user-select: none;
+            -ms-user-select: none;
         }
         
         .modal.active {
@@ -485,6 +490,11 @@
             overscroll-behavior: contain;
             /* 允许触摸操作 */
             touch-action: auto;
+            /* 允许内容选择 */
+            user-select: auto;
+            -webkit-user-select: auto;
+            -moz-user-select: auto;
+            -ms-user-select: auto;
         }
         
         .modal-body {