sidebar: reduce transparency

scss/main.scss

@@ -122,7 +122,7 @@ table.attributes td {
 .sidebar {
   .infobox, .container {
     @include shadow(2);
-    background: rgba(255, 255, 255, 0.9);
+    background: rgba(255, 255, 255, 0.97);
     border-radius: 2px;
   }