How can I make rounded TextField in flutter?

You can add rounded corners to a TextField within the decoration parameter of it

TextField(
  decoration: InputDecoration(
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(10.0),
      ),
      filled: true,
      hintStyle: TextStyle(color: Colors.grey[800]),
      hintText: "Type in your text",
      fillColor: Colors.white70),
)