diff --git a/subnets.html b/subnets.html
index 9fda322..09a6201 100644
--- a/subnets.html
+++ b/subnets.html
@@ -547,6 +547,10 @@ P		{
   background-color: #eeeeee;
 }
 
+.calc textarea {
+  height: 1.5em;
+}
+
 .disabledAction {
  color: #dddddd;
 }