diff --git a/lib/Statistics/Track/Opens.php b/lib/Statistics/Track/Opens.php
index 8b85e2da84..80cbef00a6 100644
--- a/lib/Statistics/Track/Opens.php
+++ b/lib/Statistics/Track/Opens.php
@@ -30,7 +30,7 @@ class Opens {
     if(!$display_image) return;
     // return 1x1 pixel transparent gif image
     header('Content-Type: image/gif');
-    echo "\x47\x49\x46\x38\x37\x61\x1\x0\x1\x0\x80\x0\x0\xfc\x6a\x6c\x0\x0\x0\x2c\x0\x0\x0\x0\x1\x0\x1\x0\x0\x2\x2\x44\x1\x0\x3b";
+    echo base64_decode('R0lGODlhAQABAJAAAP8AAAAAACH5BAUQAAAALAAAAAABAAEAAAICBAEAOw==');
     exit;
   }
 }
\ No newline at end of file
diff --git a/lib/Util/CSS.php b/lib/Util/CSS.php
index 5ebbd9890f..05757cb56b 100644
--- a/lib/Util/CSS.php
+++ b/lib/Util/CSS.php
@@ -160,8 +160,8 @@ class CSS {
         continue;
       }
 
-      $key_value = explode(':', $kv);
-      $array[trim($key_value[0])] = trim($key_value[1]);
+      list($selector, $rule) = explode(':', $kv, 2);
+      $array[trim($selector)] = trim($rule);
     }
 
     return $array;