We all know that CSS variables are very good and even more so when creating sites with a dark and light version. Knowing this and verifying that the color fields accept letters, numbers and symbols in version 3.x we have used variables of the type var(--link_color) or bootstrap variables and we have not had problems of any kind. But now in version 4 alpha it is not possible to use CSS variables.

Maybe you did not use it or did not think that you could use variables in the color fields of SPPB but I am sure that many have done it and for me that possibility is really something great.

Can you keep the possibility of using variables ?.