diff --git a/public_html/css/style.css b/public_html/css/style.css
index bddfd7b..53925aa 100644
--- a/public_html/css/style.css
+++ b/public_html/css/style.css
@@ -281,7 +281,7 @@ table caption::before {
 /* layout */
 
 body {
-  width: min(160ch, 100vw);
+  width: round(down, min(160ch, 100vw), 1ch);
   height: 100vh;
   margin-left: auto;
   margin-right: auto;