# Bars with a trend line (Chartist example)
> Monthly sign-ups as bars, with the least-squares trend through them added to the bar chart preset.
`src/main.ts`:
```ts
import 'chartist/styles.css';
import { barChart, trendLine } from 'chartist';
// Monthly sign-ups with the trend they follow.
barChart(
'#chart',
{
labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug'],
series: [[42, 38, 51, 47, 58, 54, 66, 63]]
},
{
low: 0,
// Centered, so the line runs through the middle of the bars.
layers: { above: [trendLine({ align: 'center' })] }
}
);
```
`index.html`:
```html
```