修改促销、优化页面布局

Change-Id: Iae813b5b6557efa7059fe6d94bc32e96c984e4ea
diff --git a/src/components/Header.css b/src/components/Header.css
index 66fe1a0..a19f9e9 100644
--- a/src/components/Header.css
+++ b/src/components/Header.css
@@ -4,7 +4,7 @@
   justify-content: space-between;
   align-items: center;
   padding: 10px 20px;
-  background-color: #6b4f3b; /* 深棕色背景 */
+  background-color: #6c3e28; /* 深棕色背景 */
   box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
 }