Example
    
    <div className="muk-helper-clearfix">
        <div style={{ width: '20%', float: 'left', marginRight: '5%'}}>
            <Placeholder width={100} height={100}>1:1</Placeholder>
        </div>
        <div style={{ width: '20%', float: 'left', marginRight: '5%'}}>
            <Placeholder width={4} height={3}>4:3</Placeholder>
        </div>
        <div style={{ width: '20%', float: 'left', marginRight: '5%'}}>
            <Placeholder width={16} height={9}>16:9</Placeholder>
        </div>
        <div style={{ width: '20%', float: 'left'}}>
                <Placeholder width={20} height={5}>20:5</Placeholder>
        </div>
    </div>