How do I theme a block created with the Views module? I'm Newbie user in drupal, i need to custom design theme block created for views module.

Example HTML: 

&lt;div id="content"&gt;
   &lt;ul&gt;
     &lt;li&gt;
        &lt;div class="title"&gt;title1&lt;/div&gt;
        &lt;div class="thumbs"&gt;&lt;img 1 ......&gt;&lt;/div&gt;
        &lt;div class="content"&gt;content1&lt;/div&gt;
     &lt;/li&gt;
     &lt;li&gt;
        &lt;div class="title"&gt;title2&lt;/div&gt;
        &lt;div class="thumbs"&gt;&lt;img 2 ......&gt;&lt;/div&gt;
        &lt;div class="content"&gt;content2&lt;/div&gt;
     &lt;/li&gt;
   &lt;/ul&gt;
&lt;/div&gt;
I'm not perfectly sure what you are asking...

If you want to theme a view then you can add a css class name under the advanced drop-down, or add a  css class to any field.

Or are you looking to adjust how a block appears using views?