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Public/static/css/main.css

@@ -172,6 +172,7 @@ ul, li {
 }
 
 #container {
+  background: url("../images/bj.jpg") no-repeat center;
   width: 100%;
   height: 100%;
   justify-content: space-around;

Public/static/css/main.scss

@@ -194,12 +194,11 @@ ul, li {
 }
 
 #container {
-  @extend .flex;
+  background:url("../images/bj.jpg")no-repeat center;
   width: 100%;
-
+  @extend .flex;
   height: 100%;
  justify-content: space-around;
-
 flex-direction: column-reverse;
   .btn-prize {
     @extend .flex;