Is anyway to create legend in gantt

Hi everybody, i have issue when work with gantt chart, i want know is there way to create legend for note highlight cell, as picture
image
i only need the highlight cell to show information, similar to the tooltip of the task

Hello Vũ,
Unfortunately, there is no way to highlight only part of the cell.
You can highlight only 00, 15, 30, and 45 cells.
To do that, you need to specify the function in the CSS property of the scale configuration:
https://docs.dhtmlx.com/gantt/desktop__configuring_time_scale.html#styling
Here is an example:
http://snippet.dhtmlx.com/5/23862e68d