title: sass dynamic width
body: <p>I'm using </p>
  
  <pre><code>.w400 { 
    width: 400px; 
  }
  
  .w110 {
    width: 110px;
  }
  
  .w600 {
    width: 600px;
  }
  </code></pre>
  
  <p>is it possible to make dynamic class with sass?</p>
  
  <p>something like </p>
  
  <pre><code>.w(size) {
      width: size+px
  }
  </code></pre>