.dart

  Container(
            padding: EdgeInsets.only(left: 10),
            decoration: BoxDecoration(
              color: Colors.grey, 
              borderRadius: BorderRadius.circular(10)
            ),
            child: TextField(
              controller: _controller,
              onSubmitted: (value) {
                if(value.isNotEmpty) {
                  vm.fetchMovies(value);
                  _controller.clear();
                }
              },