title: How can I combine multiple CSS rules?
body: <pre><code>div#id_div_allposts {   
      width: 100%;    
  }
  
  div.class_div_post {
      width: 100%;
  }
  
  div.class_div_editdelete {
      width: 100%;
  }
  </code></pre>
  
  <p>How can i write it in one line ?</p>
  
  <p>And what's the way to select a html tag with id and class ?</p>