prettier

Author: Yokomi422

docs/1-trial-session/15-project/index.mdx

@@ -141,6 +141,7 @@ stopButton.onclick = stop;
 ```
 
 ### 解答例
+
 <Answer title="ストップウォッチ">
 
 <Sandpack
@@ -153,4 +154,4 @@ stopButton.onclick = stop;
     activeFile: "/script.js",
   }}
 />
-</Answer>
+</Answer>