Edit a erpnext custom button

Hi everyone I’m with a issue. There’s a custom button of erpnext and I want edit him.
That’s the button


if I use cur_frm.custom_button but I cannot find him because there’s a space in the name. I want edit his class.
Thanks for advance.

What is the use case?

Hi @saurabh6790, is just change the size of the button and his class.

cur_frm.custom_buttons[“Make Timesheet”]

Thank you @ashish-greycube but doens’t work.

Please elaborate what doesn’t work. See screenshot below

It’s I’ve already tried and work but just in the event onload_post _render but no problem @ashish-greycube, I guess that you can close. Thank you for help.