How to add CSS effect to AJAX Calendar Extender Control?

Calendar Stylesheet
====================
.Cal_Theme .ajax__calendar_container
{
 background-color: #EDCF81; border:solid 1px #cccccc;
}

.Cal_Theme .ajax__calendar_header
{
 background-color: #FFFFEA; margin-bottom: 4px;
} 

.Cal_Theme .ajax__calendar_title,
.Cal_Theme .ajax__calendar_next,
.Cal_Theme .ajax__calendar_prev
{
 color: #004080; padding-top: 3px;
}

.Cal_Theme .ajax__calendar_body
{
 background-color: #FFFFEA; border: solid 1px #cccccc;
}

.Cal_Theme .ajax__calendar_dayname
{
 text-align:center; font-weight:bold; margin-bottom: 4px; margin-top: 2px;
} 

.Cal_Theme .ajax__calendar_day
{
 text-align:center;
}

.Cal_Theme .ajax__calendar_hover .ajax__calendar_day,
.Cal_Theme .ajax__calendar_hover .ajax__calendar_month,
.Cal_Theme .ajax__calendar_hover .ajax__calendar_year,
.Cal_Theme .ajax__calendar_active
{
 color: #FFFFFF; font-weight:bold; background-color: #4A89B9;
}

.Cal_Theme .ajax__calendar_today
{
 font-weight:bold;
}

.Cal_Theme .ajax__calendar_other,
.Cal_Theme .ajax__calendar_hover .ajax__calendar_today,
.Cal_Theme .ajax__calendar_hover .ajax__calendar_title
{
 color: #000000;
}

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Copy and paste the above stylesheet in one CSS file and Call to the control.

For Ex:
Add the below line in Head Section
<link href="../CSS/Calendar.css" rel="stylesheet" type="text/css" />


<cc1:CalendarExtender ID="txtdate_CalendarExtender" runat="server" Enabled="True"
CssClass="Cal_Theme" TargetControlID="txtdate">
</cc1:CalendarExtender>