diff --git a/src/Report/Html/Colors.php b/src/Report/Html/Colors.php
index bbdabbd4b..c57aaf8fb 100644
--- a/src/Report/Html/Colors.php
+++ b/src/Report/Html/Colors.php
@@ -22,13 +22,7 @@ final class Colors
 
     public static function default(): self
     {
-        return new self(
-            'rgb(from var(--bs-success) r g b / 0.1)',
-            'rgb(from var(--bs-success) r g b / 0.33)',
-            'rgb(from var(--bs-success) r g b / 0.67)',
-            'rgb(from var(--bs-warning) r g b / 0.1)',
-            'rgb(from var(--bs-danger) r g b / 0.1)',
-        );
+        return new self('#dff0d8', '#c3e3b5', '#99cb84', '#fcf8e3', '#f2dede');
     }
 
     public static function from(string $successLow, string $successMedium, string $successHigh, string $warning, string $danger): self
diff --git a/tests/tests/Report/Html/ColorsTest.php b/tests/tests/Report/Html/ColorsTest.php
index 50c688b6d..78f17b58f 100644
--- a/tests/tests/Report/Html/ColorsTest.php
+++ b/tests/tests/Report/Html/ColorsTest.php
@@ -21,11 +21,11 @@ public function testCanBeCreatedFromDefaults(): void
     {
         $colors = Colors::default();
 
-        $this->assertSame('rgb(from var(--bs-success) r g b / 0.1)', $colors->successLow());
-        $this->assertSame('rgb(from var(--bs-success) r g b / 0.33)', $colors->successMedium());
-        $this->assertSame('rgb(from var(--bs-success) r g b / 0.67)', $colors->successHigh());
-        $this->assertSame('rgb(from var(--bs-warning) r g b / 0.1)', $colors->warning());
-        $this->assertSame('rgb(from var(--bs-danger) r g b / 0.1)', $colors->danger());
+        $this->assertSame('#dff0d8', $colors->successLow());
+        $this->assertSame('#c3e3b5', $colors->successMedium());
+        $this->assertSame('#99cb84', $colors->successHigh());
+        $this->assertSame('#fcf8e3', $colors->warning());
+        $this->assertSame('#f2dede', $colors->danger());
     }
 
     public function testCanBeCreatedFromCustomValues(): void