diff --git a/web/kiri/output-sla.html b/web/kiri/output-sla.html
index f57c4537..9725614e 100644
--- a/web/kiri/output-sla.html
+++ b/web/kiri/output-sla.html
@@ -11,7 +11,7 @@
 </div>
 
 <div class="header"><label>preview</label></div>
-<div class="col box a-center j-center">
+<div class="f-col box a-center j-center">
     <div class="f-row a-center j-center">
         <input id="print-range" type="range" class="grow">
         <label id="print-layer"></label>