title: How add spaces between Slick carousel item
body: <p>I want to add space between two slick carousel items, but not want the space with padding, because it's reducing my element size(and I don't want that).</p>
  
  <p><img src="https://i.stack.imgur.com/mE5XN.png" alt="enter image description here"></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>    $('.single-item').slick({
          initialSlide: 3,
          infinite: false
      });</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.slick-slider {
      margin:0 -15px;
  }
  .slick-slide {
      padding:10px;
      background-color:red;
      text-align:center;
      margin-right:15px;
      margin-left:15px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
  &lt;link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/&gt;
  &lt;script src="http://cdn.jsdelivr.net/jquery.slick/1.5.0/slick.min.js"&gt;&lt;/script&gt;
  &lt;link href="http://cdn.jsdelivr.net/jquery.slick/1.5.0/slick.css" rel="stylesheet"/&gt;
  &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"&gt;&lt;/script&gt;
  &lt;div class="container"&gt;
      &lt;div class="row"&gt;
          &lt;div class="col-sm-12" style="background-color:gray;"&gt;
              &lt;div class="slider single-item" style="background:yellow"&gt;
                  &lt;div&gt;1&lt;/div&gt;
                  &lt;div&gt;2&lt;/div&gt;
                  &lt;div&gt;3&lt;/div&gt;
                  &lt;div&gt;4&lt;/div&gt;
                  &lt;div&gt;5&lt;/div&gt;
                  &lt;div&gt;6&lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Somehow I am getting space from both side, I am trying to remove that.</p>