diff --git a/css/main.css b/css/main.css
index ce263ff..0c8a003 100644
--- a/css/main.css
+++ b/css/main.css
@@ -143,7 +143,7 @@
 
 
 /* img */
-img.photo {
+.explanation img {
     max-width: 100%;
 }
 
diff --git a/oasis/oasis.html b/oasis/oasis.html
index f04f5e2..73e5bb4 100644
--- a/oasis/oasis.html
+++ b/oasis/oasis.html
@@ -46,7 +46,7 @@
 
           <h2 id="2017">2017年</h2>
           <section class="explanation">
-            <p><a href="imgp5351.jpg"><img class="photo" src="imgp5351_2.jpg"></a></p>
+            <p><a href="imgp5351.jpg"><img src="imgp5351_2.jpg" alt="moshenon"></a></p>
             <h3><a href="https://skip.koeki-prj.org/event/oasis2017/oasis2017.html">
             ゲームはこちらのページで遊べます</a></h3>