diff --git a/static/css/main.css b/static/css/main.css
index ac2c744..4dca920 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -189,3 +189,8 @@ h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
     font-family: "Source Sans Pro", "Kozuka Gothic Pr6N", Meiryo, sans-serif; !important
 }
 
+article img {
+    max-width: 100%;
+    height: auto;
+}
+