Add this code to the Custom CSS field on the Style tab of your widget’s settings:
/* Month Text Size */
.eapp-events-calendar-date-element-month {
padding: 0 0 0 0;
font-size: 16px;
font-weight: 600;
color: rgb(0, 0, 0);
}
/* Day of Week Text Size */
.eapp-events-calendar-date-element-dayOfWeek {
padding: 0 0 0 0;
font-size: 16px;
font-weight: 600;
color: rgb(0, 0, 0);
}
/* Day Text Size */
.eapp-events-calendar-date-element-day {
padding: 5px 0 5px 0;
font-size: 34px;
font-weight: 700;
color: rgb(0, 0, 0);
}