diff --git a/src/fencer.html b/src/fencer.html
index 8142863..1cd5f86 100644
--- a/src/fencer.html
+++ b/src/fencer.html
@@ -419,7 +419,7 @@ <h2>Mappings</h2>
 						<option value="fill-space-40">fill space 40</option>
 						<option value="fill-space-20">fill space 20</option>
 						<option value="grid-40">grid 40</option>
-						<option value="grid-20">grid 20</option>
+						<option value="grid-20" selected>grid 20</option>
 					</select>
 					<br>
 					<label for="integer-snapping">Snap to integers</label> <input type="checkbox" id="integer-snapping">