I believe one of these should probably work:

.CX2 .today .slotHeader {
background: rgba(64,64,64,0.8);
color: #000;
}

.CX2 .today .slotHeader .slotTitle {
color: #FFF;
}

.CX2 .today .slotContent {
background: #eeeeee69;
#border: 1px solid white;
}