diff --git a/Tests/LibWeb/Ref/manifest.json b/Tests/LibWeb/Ref/manifest.json
index 3a999f9edc..9a65ccf16c 100644
--- a/Tests/LibWeb/Ref/manifest.json
+++ b/Tests/LibWeb/Ref/manifest.json
@@ -1,4 +1,5 @@
 {
     "square-flex.html": "square-ref.html",
-    "separate-borders-inline-table.html": "separate-borders-ref.html"
+    "separate-borders-inline-table.html": "separate-borders-ref.html",
+    "opacity-stacking.html": "opacity-stacking-ref.html"
 }
diff --git a/Tests/LibWeb/Ref/opacity-stacking-ref.html b/Tests/LibWeb/Ref/opacity-stacking-ref.html
index f31ff82917..b9594db319 100644
--- a/Tests/LibWeb/Ref/opacity-stacking-ref.html
+++ b/Tests/LibWeb/Ref/opacity-stacking-ref.html
@@ -1,3 +1,8 @@
+<style>
+  body {
+    background-color: white;
+  }
+</style>
 <svg width="600" viewBox="0 0 150 100" xmlns="http://www.w3.org/2000/svg">
   <circle cx="100" cy="50" r="40" fill="#b3b3b3" />
   <circle cx="50" cy="50" r="40" fill="blue" />
diff --git a/Tests/LibWeb/Ref/opacity-stacking.html b/Tests/LibWeb/Ref/opacity-stacking.html
index 209f4a6eaf..d02dec5dca 100644
--- a/Tests/LibWeb/Ref/opacity-stacking.html
+++ b/Tests/LibWeb/Ref/opacity-stacking.html
@@ -1,3 +1,8 @@
+<style>
+  body {
+    background-color: white;
+  }
+</style>
 <svg width="600" viewBox="0 0 150 100" xmlns="http://www.w3.org/2000/svg">
   <circle cx="100" cy="50" r="40" fill="black" opacity="0.3" />
   <circle cx="50" cy="50" r="40" fill="blue" />