修改404页面样式

assets/css/content.css

@@ -8,6 +8,29 @@
   padding-top: 0;
 }
 
+/* --- 404 Page --- */
+.error-404 {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  padding: 80px 0;
+}
+
+.error-404 .container {
+  display: flex;
+  justify-content: center;
+  width: 100%;
+}
+
+.error-content {
+  max-width: 520px;
+}
+
+.error-title {
+  font-size: 4rem;
+}
+
 /* --- 首页内容区块容器 --- */
 .content-section {
   padding: 80px 0;