From the Administrator Console, select Presentation -> Views ->
Click on Auto Format...
Click on Add. Enter a name for the conditional format; select a font and a color.
Click on Condition. Enter a condition that meets your requirements. You may wish to enter a condition that covers all your lines, if you simply want to change the color. You may enter other conditions, if needed, so you may have as many color and fonts as you wish.
PS: You may also create a view for History Lines, if needed. Make sure it is the default view, otherwise it will not be used.