diff --git a/web/xfa_layer_builder.css b/web/xfa_layer_builder.css
index 46a3cbd47..eeac12534 100644
--- a/web/xfa_layer_builder.css
+++ b/web/xfa_layer_builder.css
@@ -118,7 +118,7 @@
 .xfaTop {
   display: flex;
   flex-direction: column;
-  align-items: start;
+  align-items: flex-start;
 }
 
 .xfaTop > .xfaCaption {
@@ -128,7 +128,7 @@
 .xfaBottom {
   display: flex;
   flex-direction: column-reverse;
-  align-items: start;
+  align-items: flex-start;
 }
 
 .xfaBottom > .xfaCaption {