.v-datefield-calendarpanel-day-disabled-day {
   color: #c0c0c0;
   cursor: default;
}
.birthday {
   background-image:url('birthday-2.png');
}
.busy-day {
   background-image:url('busy-day-2.png');
}
.free-day {
   background-image:url('free-day-2.png');
}