Hi BeBrave. There probably should be, but there is not. Red means the odds changed within the last 2 minutes and black means the odds have changed in the last 5. Percentages are only displayed for the side/total getting the majority of the bets, so if you see something like this:
Braves 67%
Astros 67%ov
This means 33% of the bets are on the Astros and 33% of the total wagers are on the under.
You can click on the line and navigate to the odds page where you can see what sportsbooks are moving the line.