更新 'README.md'

README.md

@@ -8,6 +8,15 @@
 app/views/main/index.html.erb
 
 
+```
+background: url(https://cloud.spacen.net/apps/files_sharing/publicpreview/ti7Z8ZDqbqNi9Z7?x=1280&y=512&a=true&file=kongjun.jpeg&scalingup=0);
+    /* background-repeat: no-repeat; */
+    background-attachment: fixed;
+    background-size: 100%;
+```
+
+
+
 Greenlight is a simple front-end interface for your BigBlueButton server. At its heart, Greenlight provides a minimalistic web-based application that allows users to:
 
   * Signup/Login with Google, Office365, OpenID Connect, or through the application itself.