Katbin

@override
  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32.0),
        child: Hero(
          tag: "search",
          child: Material(
            elevation: 2,
            shape:
                RoundedRectangleBorder(borderRadius: BorderRadius.circular(32)),
            child: SingleChildScrollView(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    TextField(
                      controller: searchController,
                      onChanged: (String value) {
                        setState(() {
                          usernameToSearch = value;
                        });
                      },
                      decoration: const InputDecoration(
                        hintText: 'Search an user or activity',
                        border: InputBorder.none,
                      ),
                      cursorColor: Colors.white,
                    ),
                    Container(
                      height: 600,
                      child: searchUsername(usernameToSearch),
                    )
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }