hi,
the panel omns is using is tint panel and the round corner can be configure in the ~/.config/tint/tintrc file like that:
(...)
#---------------------------------------------
# PANEL BACKGROUND AND BORDER
#---------------------------------------------
panel_rounded = 4
panel_border_width = 0
panel_background_color = #ffffff 0
panel_border_color = #ffffff 10
#---------------------------------------------
# TASKS
#---------------------------------------------
task_text_centered = 1
task_width = 150
task_margin = 4
task_padding = 2
task_icon_size = 0
task_font = Zekton 7
task_font_color = #ffffff 70
task_active_font_color = #ffffff 85
#---------------------------------------------
# TASK BACKGROUND AND BORDER
#---------------------------------------------
task_rounded = 2
task_background_color = #0E100F 30
task_active_background_color = #0E100F 70
task_border_width = 1
task_border_color = #ffffff 30
task_active_border_color = #EE7F07 60
(...)
for more info about tint, just dowload the doc in pdf here
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