diff --git a/www/css/ui.css b/www/css/ui.css
index 89afc04..899349b 100644
--- a/www/css/ui.css
+++ b/www/css/ui.css
@@ -41,10 +41,10 @@ main>table.list td:last-child{
     border: 0;
 }
 
-main>table.list.session td:nth-child(1){width:10rem;}
-main>table.list.session td:nth-child(2){width:10rem;}
+main>table.list.session th:nth-child(1){width:10rem;}
+main>table.list.session th:nth-child(2){width:10rem;}
 
-main>table.list.challenge td:nth-child(2){width:10rem;}
+main>table.list.challenge th:nth-child(2){width:10rem;}
 
 main>table.list td:last-child>button{
     display:block;