feat: giphy color

lib/src/giphy_attachment.dart

@@ -31,7 +31,8 @@ class GiphyAttachment extends StatelessWidget {
       );
     }
 
-    return Column(
+    return Container(
+      child: Column(
         mainAxisSize: MainAxisSize.min,
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: <Widget>[
@@ -75,7 +76,7 @@ class GiphyAttachment extends StatelessWidget {
             Container(
               alignment: Alignment.bottomCenter,
               child: Material(
-              color: messageTheme.messageBackgroundColor,
+                color: Colors.white,
                 child: AttachmentTitle(
                   messageTheme: messageTheme,
                   attachment: attachment,
@@ -88,6 +89,7 @@ class GiphyAttachment extends StatelessWidget {
               message: message,
             ),
         ],
+      ),
     );
   }
 }

lib/src/message_widget.dart

@@ -175,7 +175,7 @@ class MessageWidget extends StatefulWidget {
           'giphy': (context, message, attachment) {
             return GiphyAttachment(
               attachment: attachment,
-              messageTheme: messageTheme.copyWith(messageBackgroundColor: Colors.white),
+              messageTheme: messageTheme.copyWith(messageBackgroundColor: Colors.white,),
               message: message,
               size: Size(
                 MediaQuery.of(context).size.width * 0.8,