Slick slider change background-color for current and not current
<p>The colour of my slide blocks is red when is getting current and  <code>opacity: .6</code> when is not.</p>

<p>What I want: when is current the background-color be red and when is not be blue.</p>

<p><strong>css:</strong></p>

<pre><code>body {
  background-color: grey;
}

.slick-center .slide-h3 {
  color: #FFF;
}

.slider {
  width: 600px;
  height: 150px;
  margin: 20px auto;
  text-align: center;
}

.slide-h3 {
  margin: 10% 0 10% 0;
  padding: 40% 20%;
  background: red;
}

.slider div {
  margin-right: 5px;
}

.slick-slide {
  opacity: .6;
}

.slick-center {
  display: block;
  max-width: 10% !important;
  max-height: 20% !important;
  opacity: 1;
}
</code></pre>

<p><strong>html:</strong></p>

<pre><code>&lt;h1&gt; Slick Carousel Center mode &lt;/h1&gt;
&lt;/h1&gt;
&lt;div class="slider"&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;1&lt;/div&gt;
  &lt;/div&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;2&lt;/div&gt;
  &lt;/div&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;3&lt;/div&gt;
  &lt;/div&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;4&lt;/div&gt;
  &lt;/div&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;5&lt;/div&gt;
  &lt;/div&gt;
  &lt;div&gt;
    &lt;div class="slide-h3"&gt;6&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p><strong>js:</strong></p>

<pre><code> $(document).ready(function() {
   $('.slider').slick({
     centerMode: true,
     centerPadding: '60px',
     slidesToShow: 3,
     speed: 1500,
     index: 2,
     responsive: [{
       breakpoint: 768,
       settings: {
         arrows: false,
         centerMode: true,
         centerPadding: '40px',
         slidesToShow: 3
       }
     }, {
       breakpoint: 480,
       settings: {
         arrows: false,
         centerMode: true,
         centerPadding: '40px',
         slidesToShow: 1
       }
     }]
   });
 });
</code></pre>

<p><strong>jsfiddle:</strong>
<a href="https://jsfiddle.net/y3xw3thy/1/" rel="nofollow">https://jsfiddle.net/y3xw3thy/1/</a></p>