mastodon/app/assets/javascripts/components/components/column_header.jsx

import PureRenderMixin from 'react-addons-pure-render-mixin';

const ColumnHeader = React.createClass({

  propTypes: {
    type: React.PropTypes.string
  },

  mixins: [PureRenderMixin],

  render () {
    return (
      <div style={{ padding: '15px', fontSize: '16px', background: '#2f3441', flex: '0 0 auto' }}>
        {this.props.type}
      </div>
    );
  }

});

export default ColumnHeader;