diff --git a/assets/_custom.scss b/assets/_custom.scss
index 54848eb..8da0a8f 100644
--- a/assets/_custom.scss
+++ b/assets/_custom.scss
@@ -21,8 +21,9 @@ figure.audio-player audio {
 figure.image {
   border: $padding-1 solid var(--gray-200);
   border-radius: $border-radius;
-  overflow: hidden;
   img[data-thumbnail] {
+    border-top-left-radius: $border-radius;
+    border-top-right-radius: $border-radius;
     background-repeat: no-repeat;
     background-size: 100%;
   }
diff --git a/assets/_variables.scss b/assets/_variables.scss
index 1f34f10..b0f9b4b 100644
--- a/assets/_variables.scss
+++ b/assets/_variables.scss
@@ -1,2 +1,2 @@
-$menu-width: 18rem;
-$toc-width: 18rem;
+$menu-width: 18.5rem;
+$toc-width: 18.5rem;