How to remove tree grid border color

[hyh888]

When using tree grid, there is a color border around the grid. Would you like to help to get rid of it?
When tree node is clicked, user can see a block as the background of the cell, can the block be removed?
The following picture is the current interface:

[paramvir]

Can you please highlight which border do you want to remove.

Do you also see this border in the treegrid demo: https://paramquery.com/pro/demos/treegrid

[hyh888]

Only black and white are needed, other coloer should be removed.

[hyh888]

I make this treegrid according to the treegrid demo: https://paramquery.com/pro/demos/treegrid,but there are many usefulless bording in my tree grid.

[hyh888]

Is it possible to make font size smaller? This is the target interface that I need(without colorful background ,border and padding):

[hyh888]

I have found the example for fontsize, but the color problem is still unsolved.