update giphy label

lib/src/giphy_attachment.dart

@@ -283,18 +283,6 @@ class GiphyAttachment extends StatelessWidget {
 
   Widget _buildSentAttachment(context) {
     return Container(
-      child: Column(
-        children: [
-          Container(
-            decoration: BoxDecoration(
-              borderRadius: BorderRadius.only(
-                topRight: Radius.circular(16.0),
-                bottomRight: Radius.circular(0.0),
-                topLeft: Radius.circular(16.0),
-                bottomLeft: Radius.circular(16.0),
-              ),
-            ),
-            clipBehavior: Clip.antiAlias,
       child: GestureDetector(
         onTap: () {
           Navigator.push(context, MaterialPageRoute(builder: (_) {
@@ -305,7 +293,9 @@ class GiphyAttachment extends StatelessWidget {
             );
           }));
         },
-              child: CachedNetworkImage(
+        child: Stack(
+          children: [
+            CachedNetworkImage(
               height: size?.height,
               width: size?.width,
               placeholder: (_, __) {
@@ -326,38 +316,42 @@ class GiphyAttachment extends StatelessWidget {
               ),
               fit: BoxFit.cover,
             ),
-            ),
+            Positioned(
-          ),
-          Padding(
-            padding: const EdgeInsets.only(
-              top: 8.0,
               bottom: 8,
+              left: 8,
+              child: Material(
+                color: Colors.black.withOpacity(.5),
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Padding(
+                  padding: const EdgeInsets.symmetric(
+                    horizontal: 8.0,
+                    vertical: 4.0,
                   ),
                   child: Row(
-              children: [
-                Row(
                     children: [
                       Icon(
                         StreamIcons.lightning,
-                      color: StreamChatTheme.of(context).accentColor,
+                        color: Colors.white,
-                      size: 15.0,
+                        size: 16,
                       ),
                       Text(
                         'GIPHY',
                         style: TextStyle(
-                        color: StreamChatTheme.of(context).accentColor,
+                          color: Colors.white,
                           fontWeight: FontWeight.bold,
-                        fontSize: 11.0,
+                          fontSize: 11,
                         ),
                       ),
                     ],
                   ),
-              ],
-              mainAxisAlignment: MainAxisAlignment.start,
                 ),
-          )
+              ),
+            ),
           ],
         ),
+      ),
     );
   }
 }