I'm trying to get a Visualforce dashboard component to scroll vertically. The scrollbar track shows up, but no scrollbar. Any thoughts?
<apex:page Controller="RoleUtils" showChat="false" >
<apex:outputPanel layout="block" style="overflow:scroll;">
<apex:pageBlock title="My Team's Last Logins">
<apex:pageBlockTable value="{!MyTeam}" var="le">
<apex:column value="{!le.name}"/>
<apex:column value="{!le.UserRole.Name}"/>
<apex:column value="{!le.lastlogindate}"/>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:outputPanel>
</apex:page>