diff --git a/src/index.css b/src/index.css
index cfb6cf57..01a21545 100644
--- a/src/index.css
+++ b/src/index.css
@@ -461,6 +461,9 @@ body {
 .pane.main {
   overflow-y: auto;
   height: 100%;
+  max-width: 900px;
+  margin: 0 auto;
+  padding: 0 2rem;
 }
 
 .pane.highlights {