问题[qss]

此代码在悬停时更改background对象combobox

QComboBox QListView {
selection-background-color: rgb(255, 255, 255); 
 }

测试.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <property name="styleSheet">
   <string notr="true">

    /* вот этот код работает */


QComboBox QListView {
      background-color:rgb(52, 58, 64);
    selection-background-color:white;
    
 }
/* а вот этот нет  */
QComboBox QListView::item:hover{
border:1px;
border-color: rgb(170, 85, 127);

}</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QComboBox" name="comboBox">
    <property name="geometry">
     <rect>
      <x>250</x>
      <y>110</y>
      <width>69</width>
      <height>22</height>
     </rect>
    </property>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
    <item>
     <property name="text">
      <string>New Item</string>
     </property>
    </item>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

我需要更改border对象combobox

我StyleSheet通过Qt Designer添加。我找不到如何更改设置item comboBox。