Look at the chunk below:
<div class="ditto_summaryPost">
<h3 class="ditto_title"><a href="[~[+id+]~]">[+title+]</a></h3>
<div>[+summary+]</div>
<p class="ditto_link">[+link+]</p>
<div style="text-align:right;">by <strong>[+author+]</strong> on
[+date+]</div>
</div>
You are not bound to use them, design your post block in your HTML editor, apply styles on it. When you get done, replace sample content with Ditto tags and put in chunk, upload css file and thats it.
For example, I use DIVs for all:
<div class="ditto_summaryPost">
<div class="post-title">[+title+]</div>
<div class="post-summary">[+summary+]</div>
<div class="post-link">[+link+]</div>
<div class="post-author">[+author+]</div>
</div>
Hope it helps.