Section.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import theme from 'lib/theme'
import slugify from '@sindresorhus/slugify'

import { observer } from 'mobx-react'

import styles from './styles.module.css'

@observer
export class Section extends Component {
  static propTypes = {
    inverted: PropTypes.bool,
    stretch: PropTypes.bool,
    title: PropTypes.node,
    subtitle: PropTypes.node,
    desc: PropTypes.node,
    id: PropTypes.string,
    className: PropTypes.string,
    style: PropTypes.object,
    children: PropTypes.node
  }

  static defaultProps = {
    inverted: false,
    stretch: false
  }

  render() {
    const {
      inverted,
      stretch,
      title,
      subtitle,
      desc,
      id,
      className,
      style = {},
      children
    } = this.props

    const sectionProps = {}

    if (id || title) {
      sectionProps.id = id || slugify(title.toLowerCase())
    }

    const themeArgs = [
      styles,
      'section',
      theme(styles, `${sectionProps.id}-section`),
      inverted && theme(styles, 'inverted'),
      className
    ]

    return (
      <section
        className={theme(...themeArgs)}
        style={{
          background: inverted
            ? theme['@section-fg-color']
            : theme['@section-bg-color'],
          ...style
        }}
        {...sectionProps}
      >
        <div
          className={theme(
            styles,
            'content',
            stretch && theme(styles, 'stretch')
          )}
        >
          {title && <h1 className={theme(styles, 'title')}>{title}</h1>}

          {subtitle && (
            <h5 className={theme(styles, 'subtitle')}>{subtitle}</h5>
          )}

          {desc && <p className={theme(styles, 'desc')}>{desc}</p>}

          {children}
        </div>
      </section>
    )
  }
}