add three triptych side by side i have made a custom theme "Custom_stark" and 
made changes into .info file and added the triptychs

regions[triptych_first] = Triptych first
regions[triptych_middle] = Triptych middle
regions[triptych_last] = Triptych last


in Custom_stark.info.

But when I see with block " Demonstrate block regions (Custom_stark) "

i can see only in this default format.


And how can i get the triptych in desired format mention in below image



And below is the code for page.tpl.php

&lt;?php if ($page['triptych_first'] || $page['triptych_middle'] || $page['triptych_last']): ?&gt;
    &lt;div id="triptych-wrapper"&gt;&lt;div id="triptych" class="clearfix"&gt;
      &lt;?php print render($page['triptych_first']); ?&gt;      
  &lt;?php print render($page['triptych_middle']); ?&gt;
  &lt;?php print render($page['triptych_last']); ?&gt;
&lt;/div&gt;&lt;/div&gt; &lt;!-- /#triptych, /#triptych-wrapper --&gt;
Try this

 &lt;?php if ($page['triptych_first'] || $page['triptych_middle'] || $page['triptych_last']): ?&gt;
   &lt;div id="triptych-wrapper"&gt;
      &lt;div id="triptych" class="clearfix"&gt;
         &lt;div style="float: left; width: 25%;"&gt;
            &lt;?php print render($page['triptych_first']); ?&gt;      
         &lt;/div&gt;
         &lt;div style="float: left; width: 50%;"&gt;
            &lt;?php print render($page['triptych_middle']); ?&gt;
         &lt;/div&gt;
         &lt;div style="float: right; width: 25%;"&gt;
            &lt;?php print render($page['triptych_last']); ?&gt;
         &lt;/div&gt;
         &lt;div style="clear: both;"&gt;&lt;/div&gt;
      &lt;/div&gt;
   &lt;/div&gt;