How to apply css on RadDatePicker

Problem:

How to apply css on RadDatePicker? I am Applying css like that :

<telerik:RadDatePicker ID="RadDatePicker1" Runat="server" Culture="en-US"
CssClass="txt_box">
</telerik:RadDatePicker>

but is not working, it is giving me unwanted results.

Solution:

You should use "DateInput" tag in RadDatePicker. for example:

<telerik:RadDatePicker ID="RadDatePicker1" Runat="server" Culture="en-US">
       <DateInput CssClass="txt_box">
       </DateInput>
</telerik:RadDatePicker>