Style border every days

Can I style the border after each day?

Thank you!

Hi @linhtv97,
In order to change the border color of the chart-cell from css, you should change the .gantt_task_cell rule, like in this code fragment:
.gantt_task_cell { border-right: 1px solid red; }
Here is the snippet that demonstrates how does it work(HTML tab):
http://snippet.dhtmlx.com/206f7084a
Also, you can work with cells styles more flexible, using gantt.templates.timeline_cell_class
Here is an example:
http://snippet.dhtmlx.com/967d3e88b
If you have config with hours scale, you may want to change only the end/start day cells, in this snippet, you can see how it could be implemented:
http://snippet.dhtmlx.com/30889e955
API:
https://docs.dhtmlx.com/gantt/api__gantt_timeline_cell_class_template.html