.calendar {
    width: 175px;
    height: 160px;
}
.month_and_year {
    text-align: center;
    height: 20px;
    font-weight: bold;
}
.day, .day_names{
    width: 25px;
    float: left;
    height: 20px;
    text-align: center;
}
.day_names{
    font-weight: bold;
}