diff --git a/src/static/system-installer-dark.css b/src/static/system-installer-dark.css
index f557281..6a17e85 100644
--- a/src/static/system-installer-dark.css
+++ b/src/static/system-installer-dark.css
@@ -12,6 +12,8 @@ body {
     min-height: 600px;
 }
 
+html, body {margin: 0; height: 100%; overflow: hidden;}
+
 .frame {
     border-radius: 10px;
     background-color: #404040;