diff --git a/src/containers/App/App.css b/src/containers/App/App.css
index 44ef5ca463891739ff8de1973ddd068acad15cbc..1c956a5965020f435b4d984a47996baee2015a7a 100644
--- a/src/containers/App/App.css
+++ b/src/containers/App/App.css
@@ -122,7 +122,7 @@ footer a:hover {
 .custom-header-home {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/image/zxa-tp.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -132,7 +132,7 @@ footer a:hover {
 .custom-header-team {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -142,7 +142,7 @@ footer a:hover {
 .custom-header-attributions {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -153,7 +153,7 @@ footer a:hover {
 .custom-header-contribution {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -164,7 +164,7 @@ footer a:hover {
 .custom-header-description {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -175,7 +175,7 @@ footer a:hover {
 .custom-header-education {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/education.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -185,7 +185,7 @@ footer a:hover {
 .custom-header-engineering {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/engineering.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -195,7 +195,7 @@ footer a:hover {
 .custom-header-entrepreneurship {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/entrepreneurship.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -205,7 +205,7 @@ footer a:hover {
 .custom-header-experiments {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/experiment.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -215,7 +215,7 @@ footer a:hover {
 .custom-header-hardware {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/hardware.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -225,7 +225,7 @@ footer a:hover {
 .custom-header-human-practices {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/hp.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -235,7 +235,7 @@ footer a:hover {
 .custom-header-inclusivity {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/inclusivity.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -245,7 +245,7 @@ footer a:hover {
 .custom-header-measurement {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -255,7 +255,7 @@ footer a:hover {
 .custom-header-model {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/model.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -265,7 +265,7 @@ footer a:hover {
 .custom-header-notebook {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/notebook.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -276,7 +276,7 @@ footer a:hover {
 .custom-header-results {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/results.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -286,7 +286,7 @@ footer a:hover {
 .custom-header-safety {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/header/safety.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -296,7 +296,7 @@ footer a:hover {
 .custom-header-software {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */
@@ -306,7 +306,7 @@ footer a:hover {
 .custom-header-sustainable {
   width: 100vw;
   height: 100vh;
-  background-image: url('https://static.igem.wiki/teams/5378/school-badge/yanyintech.webp'); /* 背景图片路径 */
+  background-image: url('https://placehold.co/1200x600'); /* 背景图片路径 */
   background-size: cover;        /* 使背景图片覆盖整个容器 */
   background-position: center;   /* 居中对齐背景图片 */
   background-repeat: no-repeat;  /* 防止背景图片重复 */