diff --git a/src/Drivers/Gd/Modifiers/ContainModifier.php b/src/Drivers/Gd/Modifiers/ContainModifier.php
index d3c91df5..7d5048df 100644
--- a/src/Drivers/Gd/Modifiers/ContainModifier.php
+++ b/src/Drivers/Gd/Modifiers/ContainModifier.php
@@ -2,6 +2,9 @@
 
 namespace Intervention\Image\Drivers\Gd\Modifiers;
 
+use Intervention\Image\Colors\Rgb\Channels\Blue;
+use Intervention\Image\Colors\Rgb\Channels\Green;
+use Intervention\Image\Colors\Rgb\Channels\Red;
 use Intervention\Image\Drivers\DriverModifier;
 use Intervention\Image\Interfaces\ColorInterface;
 use Intervention\Image\Interfaces\FrameInterface;
@@ -48,7 +51,13 @@ class ContainModifier extends DriverModifier
 
         // make image area transparent to keep transparency
         // even if background-color is set
-        $transparent = imagecolorallocatealpha($modified, 255, 0, 255, 127);
+        $transparent = imagecolorallocatealpha(
+            $modified,
+            $background->channel(Red::class)->value(),
+            $background->channel(Green::class)->value(),
+            $background->channel(Blue::class)->value(),
+            127,
+        );
         imagealphablending($modified, false); // do not blend / just overwrite
         imagecolortransparent($modified, $transparent);
         imagefilledrectangle(
diff --git a/tests/Drivers/Gd/Modifiers/ContainModifierTest.php b/tests/Drivers/Gd/Modifiers/ContainModifierTest.php
index 7a29aae2..ebcb1d64 100644
--- a/tests/Drivers/Gd/Modifiers/ContainModifierTest.php
+++ b/tests/Drivers/Gd/Modifiers/ContainModifierTest.php
@@ -23,7 +23,7 @@ class ContainModifierTest extends TestCase
         $this->assertEquals(200, $image->width());
         $this->assertEquals(100, $image->height());
         $this->assertColor(255, 255, 0, 255, $image->pickColor(0, 0));
-        $this->assertColor(255, 0, 255, 0, $image->pickColor(140, 10));
+        $this->assertColor(255, 255, 0, 0, $image->pickColor(140, 10)); // transparent
         $this->assertColor(255, 255, 0, 255, $image->pickColor(175, 10));
     }
 }