如何将ChartJS样式设置为始终位于div的底部？

.chart-container {
  position: relative;
  height: 400px;
}

<div class="chart-container">
  <canvas id="myChart"></canvas>
</div>

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
  type: 'bar',
  data: {
    labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
    datasets: [{
      label: '# of Votes',
      data: [12, 19, 3, 5, 2, 3],
      backgroundColor: 'rgba(255, 99, 132, 0.2)',
      borderColor: 'rgba(255, 99, 132, 1)',
      borderWidth: 1
    }]
  },
  options: {
    responsive: true,
    maintainAspectRatio: false
  }
});

.chart-container canvas {
  position: absolute;
  bottom: 0;
}