styled-component.js

import React from 'react';
import styled from 'styled-components';

// By using string interpolation to wrap a function in
// your style definition, you can access the props of the
// component & the theme.
const Button = styled.button`
  color: ${({ theme }) => theme.color.blue};
`;

export default () => {
  return (
    <Button /> 
  );
};