react-context-consume.js

import React, { Component } from 'react'
import ThemeContext from './context/ThemeContext';

export default class Body extends Component {
  render() {
    return (
      <ThemeContext.Consumer>
        {
          (theme) => (
            <div className="body" style={{color: theme.fontColor, background: theme.bodybg}}>
             Some text goes here
            </div>
          )
        }
      </ThemeContext.Consumer>
    )
  }
}