diff --git a/css/grayscale.scss b/css/grayscale.scss
index 12009b6d17..a8c7e2528a 100644
--- a/css/grayscale.scss
+++ b/css/grayscale.scss
@@ -386,7 +386,7 @@ body {
      position: absolute;
      background-color: rgba(0, 0, 0, 0.5);
      width: 100%;
-     height: 100%;
+     min-height: 100%;
      top: 0;
      right: 0;
      bottom: 0;