Saving throws colored squares

Hi, in the default macro of saving throws I see sometimes red squares and green squares around numbers. Ususally, green ones are around high numbers, and red ones around low numbers. But sometimes high and low numbers don't have any colored square, even if they are higher or lower than previous ones with squares around. It seems partially random. How it works? Thanks a lot as usual :-)

Generally, the total number doesn't matter, it is what the exact die roll was that matters for the highlight.&nbsp; By default, the following is true: Green=highest result on the die, like rolling a 12 on a d12. Blue=having both the highest and lowest results on a die, like rolling 4d6 and having both a 1 and a 6 in the results. Red=having the lowest result on the die, like rolling a 1 on a d8. So, if you rolled a d20+13 and got 14, it would be red because the die result was a 1 (lowest die value).&nbsp; If someone rolled a d20-3 and got a 17, it would be green because the die result was a 20 (highest die value). The highlighting is used for critical success and failure, and can be altered as desired in your macros. <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>

Very exhaustive, thank you! :-)