diff --git a/popup/index.css b/popup/index.css
index 2248776..1e6fad3 100644
--- a/popup/index.css
+++ b/popup/index.css
@@ -1,6 +1,9 @@
+body {
+    max-width: 360px;
+}
+
 h2 {
-    margin-left: 8px;
-    margin-right: 8px;
+    margin: 12px 8px 8px;
 }
 
 .panel-list-item > .icon {
@@ -24,7 +27,9 @@ h2 {
     margin: 0;
     padding: 0 8px;
     height: 128px;
+    overflow-x: hidden;
     overflow-y: scroll;
+    background-color: #ebebeb;
 }
 #space-api code {
     font-family: monospace;