diff --git a/style.css b/style.css
index 283946e..f72a69b 100644
--- a/style.css
+++ b/style.css
@@ -101,8 +101,8 @@ body {
 }
 
 .toc-letters {
-  display: flex;
-  flex-wrap: wrap;
+  display: grid;
+  grid-template-columns: repeat(9, 1fr);
   gap: 6px;
   margin-bottom: 16px;
 }
@@ -110,6 +110,7 @@ body {
 .toc-letters a {
   font-size: 0.75rem;
   text-decoration: none;
+  text-align: center;
   color: var(--accent-deep);
   padding: 4px 6px;
   border-radius: 6px;