style:

src/views/orders/Follow.jsx

@@ -238,7 +238,7 @@ function Follow() {
           </Splitter>
         </Layout.Content>
 
-        <Button icon={collapsed ? <LeftOutlined /> : <UnorderedListOutlined />} onClick={() => setCollapsed(!collapsed)} className={`absolute z-10 rounded-none rounded-l ${collapsed ? 'right-1 top-36' : 'right-8 top-20'}`} />
+        <Button icon={collapsed ? <LeftOutlined /> : <UnorderedListOutlined />} onClick={() => setCollapsed(!collapsed)} className={`absolute z-10 rounded-none  ${collapsed ? 'right-1 top-36 rounded-l-xl' : 'right-8 top-20 rounded-l'}`} size={collapsed ? 'small' : 'middle'} />
         <Layout.Sider
           width='280'
           theme='light'