diff --git a/box-alignment/overview/grid-gap.html b/box-alignment/overview/grid-gap.html
index 090125a4..57ad5572 100644
--- a/box-alignment/overview/grid-gap.html
+++ b/box-alignment/overview/grid-gap.html
@@ -72,7 +72,7 @@
     .box {
       display: grid;
       grid-template-columns: 1fr 1fr 1fr;
-      grid-gap: 10px 2em;
+      gap: 10px 2em;
     }
 
     .box :first-child {
@@ -97,7 +97,7 @@
 .box {
   display: grid;
   grid-template-columns: 1fr 1fr 1fr;
-  grid-gap: 10px 2em;
+  gap: 10px 2em;
 }
 
 .box :first-child {