.calendar-month {
    table-layout: fixed;
}
.calendar-month > tbody > tr > td {
    border: 1px solid #666;
    padding: 0 0 2em 0;
}
.day-number {
    width: 100%;
    text-align: right;
    padding: 0 1em 0 0;
    background-color: #ddd;
}