Update courses-cn.html

Author: riverfor

docs/courses-cn.html

@@ -11,28 +11,28 @@
     <div class="container mx-auto p-4">
         <div class="grid grid-cols-1 gap-6">
             <!-- Image 1 -->
-            <a href="#" onclick="milib.download('https://edu.qpython.org/static/yhc-startup.png','image/jpg')" class="block bg-white rounded-lg shadow-lg overflow-hidden">
+            <a href="#" onclick="milib.download('https://edu.qpython.org/static/yhc-startup.png','image/jpg')" class="block bg-gray-100 rounded-lg shadow-lg overflow-hidden">
                 <img src="https://qpyio.oss-cn-shenzhen.aliyuncs.com/website/2024/12/qpy-course.png" width="100%">
-                <div class="p-4">
+                <div class="p-4 bg-white">
                 <p style='padding:0px 10px;color:grey'>截图 & 扫码关注学习应用（服务号：QPython编程）或添加River+（微信号yhc-startup）获得学习帮助</p>
                 </div>
             </a>
             <!-- Image 2 -->
-            <a href="#" onclick="milib.openUrl('https://www.bilibili.com/video/BV1bw4m1C7bP/')" class="block bg-grey-100 rounded-lg shadow-lg overflow-hidden">
+            <a href="#" onclick="milib.openUrl('https://www.bilibili.com/video/BV1bw4m1C7bP/')" class="block bg-gray-100 rounded-lg shadow-lg overflow-hidden">
                 <img src="https://edu.qpython.org/static/qpython2.jpeg" alt="QPython起源" class="w-full">
                 <div class="p-4 bg-white">
                     <h2 class="text-xl font-bold text-center">QPython起源</h2>
                 </div>
             </a>
-            <a href="#" onclick="milib.openUrl('https://www.bilibili.com/video/BV1Gi9iYYE6b/')" class="block bg-grey-100 rounded-lg shadow-lg overflow-hidden">
+            <a href="#" onclick="milib.openUrl('https://www.bilibili.com/video/BV1Gi9iYYE6b/')" class="block bg-gray-100 rounded-lg shadow-lg overflow-hidden">
                 <img src="https://edu.qpython.org/static/shiyong-nobg.png" alt="QPython使用介绍" class="w-full">
                 <div class="p-4 bg-white">
                     <h2 class="text-xl font-bold text-center">QPython使用介绍</h2>
                 </div>
             </a>
 
             <!-- Image 3 -->
-            <a href="#" onclick="milib.openUrl('https://mp.weixin.qq.com/s/UVpkhDtnL-00CpgS11PkWg')" class="block bg-grey-100 rounded-lg shadow-lg overflow-hidden">
+            <a href="#" onclick="milib.openUrl('https://mp.weixin.qq.com/s/UVpkhDtnL-00CpgS11PkWg')" class="block bg-gray-100 rounded-lg shadow-lg overflow-hidden">
                 <img src="https://edu.qpython.org/static/zhishi-nobg.png" alt="QPython知识星球" class="w-full">
                 <div class="p-4 bg-white">
                     <h2 class="text-xl font-bold text-center">QPython VIP社区</h2>