React Chartist: make red label

How i can make red label at chart. I want to make red just Sunday and Saturday and leave the others gray:

 .ct-label {
    font-size: 9px;
    color: red; // this is make all label the red
  }

<div style={{height: '100%'}} className='position-relative ct-chart ct-hidden-points'>
          <ChartistGraph
            data={dataForChart}
            options={options}
            type='Line'
            style={{height: '80px', width: '100%'}}
          />
</div>

I solved this problem adding action listener to chart

function handleDrawChart(event) {
    if (event.type === 'label' && event.axis.units.pos === 'x') {
      if (event.text.match(/S[au]/gm)) {
        /* eslint-disable-next-line */
        event.element._node.children[0].style.color = 'red';
      }
    }
  }