For the static plots, blue solid/red dotted lines on the bandstructure plot correspond to the two spin channels, so they are the bands of opposite spin, respectively. I’m not sure whether this changed in the past 5 months or whether I just got it wrong the first time, but the DOS plot colors correspond to the atom-projected DOS (labelled in the upper right hand corner of the DOS).
Currently, when you click on the “interactive plots” option, this changes. The bandstructure is all one color (blue), but the different spins are still indicated via solid/dashed lines. The different spins in the “total” DOS are indicated by different colors, but can also be plotted in “atom-projected” (or “orbital-projected”) mode using the options at the bottom.
I think this should be changed so that the interactive plotting modes is consistent with the static plot, so I’ll filed an issue on our web code repo. I’ll follow up here if we decide to change this.