diff --git a/source/css/layout/common/markdown.styl b/source/css/layout/common/markdown.styl
index c2695a7..a2abf83 100644
--- a/source/css/layout/common/markdown.styl
+++ b/source/css/layout/common/markdown.styl
@@ -69,7 +69,7 @@
 
 
   h1, h2, h3, h4, h5, h6 {
-  //  TODO: ...
+    //  TODO: ...
   }
 
   h1 {
@@ -125,9 +125,10 @@
 
 
   img {
+    box-sizing: initial;
     padding: 2px;
     margin: 2px 0;
-    width: 100%;
+    max-width: 100%;
     border: 1px solid var(--border-color);
   }