In the narrowest layout (see screenshot below), the boxes should have a red background, not a blue one.
Also, consider using 3 different colors (A, B, C). It took me a while to figure out the relations because I wasn't sure which boxes are A and which are B :)
In the narrowest layout (see screenshot below), the boxes should have a red background, not a blue one.
Also, consider using 3 different colors (A, B, C). It took me a while to figure out the relations because I wasn't sure which boxes are A and which are B :)