diff --git a/core/themes/seven/css/maintenance-page.css b/core/themes/seven/css/maintenance-page.css
index e6a554c..100ffe8 100644
--- a/core/themes/seven/css/maintenance-page.css
+++ b/core/themes/seven/css/maintenance-page.css
@@ -133,6 +133,7 @@
   html {
     display: table;
   }
+  .install-page,
   .maintenance-page {
     display: table-cell;
     padding: 1em 0;