diff --git a/docs/lab/css/common.css b/docs/lab/css/common.css
index d066b65a9..b76ef35c7 100644
--- a/docs/lab/css/common.css
+++ b/docs/lab/css/common.css
@@ -10,7 +10,7 @@ html, body {
 .part-left {
   display: flex;
   flex-direction: column;
-  width: 50%;
+  width: 45%;
   border-right: 1px solid #ddd;
 }
 
@@ -81,4 +81,4 @@ html, body {
 .part-right .console {
   position: relative;
   height: 30%;
-}
\ No newline at end of file
+}