Hi Bob,

Thanks for your response.

I am developing the Search Page which display results based on some criteria.

When I click on Search Button and rerender PBlock1 part, the css of the page gets distraced and the layout looks wierd.
This works fine when I refresh the complete page.(but this will nor serve my purpose, as I need to show progress spinner when page renders)

The CSS I used in my page from this site:
http://sfdc-styleguide.herokuapp.com

My code:
/.****************************************************/
<apex:commandButton value="New" action="{!NewJP}" styleclass="default one uiBlock uiButton forceActionButton label bBody truncate" status="runReportST" rerender="PBlock1"/>

<apex:pageblock Id="PBlock1">
<apex:repeat value="{!SomeList}" var="ls">
        <article class="mam bg-1 border border--3 brm" Id="art2">
            <table width="100%">
    <tr height="10px">
    </tr>
    <tr>
     <td width="5%"/>
     <td width="30%" align="left">
      <apex:outputLabel>
       <apex:outputLink value="/{!res.Id}" target="_self" style="color:#3c3d3e">
        {!res.Name}
       </apex:outputLink>
      </apex:outputLabel>
     </td>
       <td width="60%" align="left">
       </td>
     <td width="5%"/>
    </tr>
   </table>
</apex:repeat>
</apex:pageblock>

/****************************************************/
The above page block displays search results in Cards