Most cms have such generic class, and it is quite normal and useful to have them in xoops
<{* Center blocks display order valid values are: lrc (left right / center) lcr (left center right) clr (center / left right) *}>
<{assign var=theme_top_order value=clr}>
<{assign var=theme_bottom_order value=clr}>
<{if $xoBlocks.page_topleft or $xoBlocks.page_topcenter or $xoBlocks.page_topright}>
<div class="xo-blockszone xo-<{$theme_top_order}>pageblocks" id="xo-page-topblocks">
<{includeq file="$theme_name/centerblocks.html" topbottom=top lcr=$theme_top_order|substr:0:1}>
<{includeq file="$theme_name/centerblocks.html" topbottom=top lcr=$theme_top_order|substr:1:1}>
<{includeq file="$theme_name/centerblocks.html" topbottom=top lcr=$theme_top_order|substr:2:1}>
</div>
<{/if}>
<{if $xoBlocks.canvas_left and $xoBlocks.canvas_right}><{assign var=columns_layout value='threecolumns-layout'}>
<{elseif $xoBlocks.canvas_left}><{assign var=columns_layout value='leftcolumn-layout'}>
<{elseif $xoBlocks.canvas_right}><{assign var=columns_layout value='rightcolumn-layout'}>
<{/if}>
<{if $xoConfig.breadcrumb}><{include file="db:xcenter_breadcrumb.html"}><{/if}>
<div style="float:right; clear:none">
<{if $xoConfig.share}>
<div style="float:left;"><{$xoConfig.sharecode}></div>
<{/if}>
<{if $xoConfig.rss && $catid}>
<div style="float:right;">
<a href="<{$xoops_url}>/modules/xcenter/rss.php?catid=<{$catid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/rss.png" alt="rss"/>
</a>
</div>
<{/if}>
</div>
<p style="clear:both; height:2px;"> </p>
<h1><{$xcenter_pagetitle}></h1>
<div class="xoXcenter" id="xoXcenter"><{$xcenter_text}></div>
<div class="xoIconBar" id="xoIconBar">
<{if $xoAuthor}>
<{$smarty.const._XTR_WRITTENBY}><a href="<{$xoops_url}>/userinfo.php?uid=<{$xoAuthor.uid}>" title="">
<{if $xoAuthor.name}>
<{$xoAuthor.name}>
<{else}>
<{$xoAuthor.uname}>
<{/if}>
</a>
<{/if}>
<{$xoPubdate}>
<{if $xoConfig.print}>
<a href="<{$xoops_url}>/modules/xcenter/print.php?storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/print.png" alt="Print"/>
</a>
<{/if}>
<{if $xoConfig.pdf}>
<a href="<{$xoops_url}>/modules/xcenter/pdf.php?storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/pdf.png" alt="Pdf"/>
</a>
<{/if}>
</div>
<div style="float:right; clear:none">
<{if $xoops_isadmin}>
<{if $xoXcenter.storyid}>
<a href="<{$xoops_url}>/modules/xcenter/admin/index.php?op=edit&fct=xcenter&storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/edit.png" alt="edit"/>
</a>
<a href="<{$xoops_url}>/modules/xcenter/admin/index.php?op=delete&fct=xcenter&storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/delete.png" alt="delete">
</a>
<a href="<{$xoops_url}>/modules/xcenter/admin/index.php?op=copy&fct=xcenter&storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/copy.png" alt="copy" />
</a>
<{/if}>
<{else}>
<{if $xoXcenter.storyid}>
<{if $xoXcenter.hasEdit}>
<a href="<{$xoops_url}>/modules/xcenter/manage.php?op=edit&fct=xcenter&storyid=<{$xoXcenter.storyid}>">
<img src="<{$xoops_url}>/modules/xcenter/images/edit.png" alt="edit" />
</a>
<{/if}>
<{if $xoXcenter.hasDelete}>
<a href="<{$xoops_url}>/modules/xcenter/manage.php?op=delete&fct=xcenter&storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/delete.png" alt="delete" />
</a>
<{/if}>
<{if $xoXcenter.hasCopy}>
<a href="<{$xoops_url}>/modules/xcenter/manage.php?op=copy&fct=xcenter&storyid=<{$xoXcenter.storyid}>" title="">
<img src="<{$xoops_url}>/modules/xcenter/images/copy.png" alt="copy" />
</a>
<{/if}>
<{/if}>
<{/if}>
</div>
<{if $tagbar}><{include file="db:tag_bar.html"}><{/if}>
<{if $xoXcenter.nocomments == 0}>
<br /><br /><br />
<div style="text-align: center; padding: 3px; margin: 3px;">
<{$commentsnav}>
<{$lang_notice}>
</div>
<div style="margin: 3px; padding: 3px;">
<!-- start comments loop -->
<{if $comment_mode == "flat"}>
<{include file="db:system_comments_flat.html"}>
<{elseif $comment_mode == "thread"}>
<{include file="db:system_comments_thread.html"}>
<{elseif $comment_mode == "nest"}>
<{include file="db:system_comments_nest.html"}>
<{/if}>
<!-- end comments loop -->
</div>
<{/if}>