diff --git a/css/derekovecs.css b/css/derekovecs.css
index 6b0f0e6..c049257 100644
--- a/css/derekovecs.css
+++ b/css/derekovecs.css
@@ -201,6 +201,16 @@
     //  border-bottom: 1px solid #111;
 }
 
+/* The scores in the result tables are read column by column, which only works
+   if the digits line up. Fira Sans and Fira Sans Condensed both carry tabular
+   figures in their tnum feature - without it their digits vary in width by
+   almost a third, from 433 to 558 units. font-feature-settings is the fallback
+   for browsers that do not know font-variant-numeric. */
+table.dataTable {
+    font-variant-numeric: tabular-nums;
+    font-feature-settings: "tnum" 1;
+}
+
 .dataTables_filter input { width: 16ex }
 
 .dt-button {