CSS not working

[amarshi]

Hi All,
Any idea why css not displaying nor the datatable , for the bewlo code
<h3>Client Side Scrolling</h3>
<p:dataTable var="temp" value="#{myManagedBean.employees}" scrollable="true" height="150" rendered="true">

<p:column rendered="true" styleClass="number">
<h:outputText value="#{temp.empId}" />
</p:column>
<p:column rendered="true" styleClass="number">
<h:outputText value="#{temp.empName}" />
</p:column>

<p:column rendered="true" styleClass="number">
<h:outputText value="#{temp.empSal}" />
</p:column>
</p:dataTable>