div.ui-datepicker {
    font-size: 80%;
}
#dummy {
    height:10px;
}

table.ui-datepicker-calendar tbody td:first-child a.ui-state-default{
    color: #F00;
}
table.ui-datepicker-calendar tbody td:last-child a.ui-state-default {
    color: #00F;
}