button.js

class Button extends React.Component {
  render() {
    return (
      <TouchableOpacity
        style={{
          backgroundColor: "blue",
          padding: 20,
          borderRadius: 50
        }}
      >
       <Text
         style={{
           color: "white",
           fontSize: 20
         }}
       >
         </Text>
       </TouchableOpacity>
    );
  }
}