update fab style

lib/src/widgets/logger_fab.dart

@@ -98,19 +98,24 @@ class _FabButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ClipOval(
+    return Container(
-      child: Container(
       decoration: BoxDecoration(
-          color: Colors.blueAccent.withOpacity(0.4),
+        color: Theme.of(context).accentColor,
         borderRadius: BorderRadius.circular(25),
+        boxShadow: [
+          BoxShadow(
+            offset: Offset(0, 3),
+            color: Colors.black12,
+            blurRadius: 4,
+          )
+        ],
       ),
-        height: 50,
+      height: 48,
-        width: 50,
+      width: 48,
       child: Icon(
         Icons.code,
         color: Colors.white70,
       ),
-      ),
     );
   }
 }