diff --git a/lib/core-common/templates/base-preview-head.html b/lib/core-common/templates/base-preview-head.html
index 39baba09b3fb..45c0c3032dac 100644
--- a/lib/core-common/templates/base-preview-head.html
+++ b/lib/core-common/templates/base-preview-head.html
@@ -237,8 +237,8 @@
   .sb-argstableBlock td:nth-of-type(3) {
     width: 15%;
   }
-  .sb-argstableBlock th:laste-of-type,
-  .sb-argstableBlock td:laste-of-type {
+  .sb-argstableBlock th:last-of-type,
+  .sb-argstableBlock td:last-of-type {
     width: 25%;
     padding-right: 20px;
   }