i added simple css and its running well.
.MyCalendar .ajax__calendar_container {
border: 1px solid #646464;
background-color: lemonchiffon;
color: red;
}
.MyCalendar .ajax__calendar_container th {
padding: 0px;
}
.MyCalendar .ajax__calendar_container td {
background-color: lemonchiffon;
padding: 0px;
}
.MyCalendar .ajax__calendar_other .ajax__calendar_day, .MyCalendar .ajax__calendar_other .ajax__calendar_year {
color: black;
}
.MyCalendar .ajax__calendar_hover .ajax__calendar_day, .MyCalendar .ajax__calendar_hover .ajax__calendar_month, .MyCalendar .ajax__calendar_hover .ajax__calendar_year {
color: black;
}
.MyCalendar .ajax__calendar_active .ajax__calendar_day, .MyCalendar .ajax__calendar_active .ajax__calendar_month, .MyCalendar .ajax__calendar_active .ajax__calendar_year {
color: black;
font-weight: bold;
}