diff --git a/src/app.css b/src/app.css
index f4c1966..0f06bb4 100644
--- a/src/app.css
+++ b/src/app.css
@@ -59,6 +59,8 @@ textarea, input, #output-graph {
 	overflow-x: scroll;
 	
 	margin: 1em 0;
+	border-left-width: 0;
+	border-right-width: 0;
 }
 
 footer {