Yes, each userlist has a class surrounding it and each field row has a class as well specific to that field (by name). You need to right click and inspect in Chrome or Firefox to find these classes or try using the below structure.
Specific Userlist: cbUserListT_#
Replace # with the actual ID of the userlist.
Specific Field
Field Label: cbUserListFT_FIELD_NAME
Field Value: cbUserListFC_FIELD_NAME
Replace FIELD_NAME with the actual name of the field. Putting these two together for example could be used as follows.
Code:
.cbUserListT_4 .cbUserListFT_cb_text,
.cbUserListT_4 .cbUserListFC_cb_text {
background: red;
}