diff --git a/preserves.css b/preserves.css
index 6dce95d..8bd89bf 100644
--- a/preserves.css
+++ b/preserves.css
@@ -190,7 +190,7 @@ table.postcard-grammar { background: #e9f0f9; }
 .postcard-grammar.binarysyntax { color: black; }
 .postcard-grammar tr > *:nth-child(1) { width: 7em; text-align: right; }
 .postcard-grammar.binarysyntax tr > *:nth-child(1) { width: 13em; text-align: right; }
-.postcard-grammar tr > *:nth-child(2) { width: 1em; }
+.postcard-grammar tr > *:nth-child(2) { width: 1em; text-align: center; }
 .postcard-grammar sup {
     color: #040;
     font-size: 0.9rem;