Espaçamento Tiles

Front-end
#1

Olá pessoal,
Estou tentando tirar o espaço entre as células do tiles, alguém pode me ajudar?
Já tentei colocar o border e o padding no CSS com valor 0px mas não deu certo:
Meu código:

<!DOCTYPE tiles-definitions PUBLIC
   "-//Apache Software Foundation//DTD Tiles Configuration//EN"
   "http://jakarta.apache.org/struts/dtds/tiles-config.dtd">

<tiles-definitions>
   <definition name="header-menu-content" path="/headerMenuContentLayout.jsp">
       <put name="gridClass"           value="headerMenuContent"/>
       <put name="headerClass"         value="header"/>
       <put name="menuColumnClass"     value="menuColumn"/>
       <put name="contentColumnClass"  value="contentColumn"/>
   </definition>
   
   <definition name="book" extends="header-menu-content">
      <put name="header"         value="/bookHeader.jsp"/>
      <put name="menu"           value="/bookMenu.jsp"/>
      <put name="content"        value="/bookContent.jsp"/>
   </definition>
</tiles-definitions>

Aqui monto o layout, mas tem um espaço chato entre o header e o menu e conteúdo.

<h:panelGrid columns="2" styleClass="#{gridClass}"
             headerClass="#{headerClass}"
             columnClasses="#{menuColumnClass}, #{contentColumnClass}">
    <f:facet name="header">
        <f:subview id="header">
            <tiles:insert attribute="header" flush="false"/>
        </f:subview>
    </f:facet> 
    <f:subview id="menu">
        <tiles:insert attribute="menu" flush="false"/>
    </f:subview>
    <f:subview id="content">
        <tiles:insert attribute="content" flush="false"/>
    </f:subview>
</h:panelGrid>

Valeu

[]´s

#2