Fix CSS discrepancy in issue #6508 (#6509)

Author: hidaviddong

src/content/learn/reacting-to-input-with-state.md

@@ -545,6 +545,7 @@ body { margin: 0; padding: 0; height: 250px; }
   width: 200px;
   height: 200px;
   border-radius: 10px;
+  border: 5px solid transparent;
 }
 
 .picture--active {