style: 修复a.html中CSS语法错误并调整格式

hybrid/html/a.html

@@ -27,9 +27,10 @@
 				margin-bottom: 10px;
 			}
 
-			:root#app｛ background: #4298fd0d;
-			｝::v-deep.fm-form-item｛ magin-bottom:10px . !important;
-			｝
+			:root#app{ background: #4298fd0d;
+			}
+			::v-deep.fm-form-item{ margin-bottom:10px !important;
+		     }
 		</style>
 		<div id="app">