Things like that are usually built into a system specific roll template to provide some logic for the dice rolls (for critical damage as an example). The default template has none of that. Of course, you can still change the crit threshold in the roll formula to trigger the green outline. <a href="https://wiki.roll20.net/Dice_Reference#Critical_Success_and_Fumble_Points" rel="nofollow">https://wiki.roll20.net/Dice_Reference#Critical_Success_and_Fumble_Points</a>