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CSS

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HTML 

              
                <link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/jquery.slick/1.4.1/slick.css"/>
<!--<link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/jquery.slick/1.4.1/slick-theme.css"/>-->
<!-- <link rel="stylesheet" type="text/css" href="css/style.css"> -->

<!-- *** SCRIPTS GO AT THE END *** -->
<!-- <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="//cdn.jsdelivr.net/jquery.slick/1.4.1/slick.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/TweenMax.min.js"></script> -->

<div class="mouseOver parent parent2">
  <div class="follower"></div>
  <div class="sliderParent">
    <div class="slider" id="featured-content">
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#1]The greatest breakthroughs in gaming history of the past 25 years</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>Best game reboots</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#3]The greatest breakthroughs</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#4]The greatest breakthroughs</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#5]The greatest breakthroughs in gaming</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#6]The greatest breakthroughs in gaming history of</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#7]The greatest breakthroughs in gaming history of the past</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#8]The greatest breakthroughs in gaming history of the past 25 years</h2>
            </a>
         </div>
         <div>
            <a href="#">
               <figure class="thumbnail ratio-16by9"><img src="http://dummyimage.com/464x16:9/3498db/fff.gif" alt=""></figure>
               <h2>[#9]The greatest breakthroughs in gaming history of the past 25 years</h2>
            </a>
         </div>
        </div>
      </div>
  </div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="//cdn.jsdelivr.net/jquery.slick/1.4.1/slick.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/TweenMax.min.js"></script>
!

CSS 

              
                /* Slick slider */
.sliderParent {
  background-color: #e2e2e2;
  padding: 120px;
}

.slider {
  background-color: red;
}
.slick-slide img {
  transition: all 0.3s ease;
  width: 100%;
}
.slick-slide:hover img {
  opacity: 0.5;
  height: 125%;
  left: -12.5%;
}
/* Slick slider: Arrows */
.slick-prev,
.slick-next {
  font: normal normal normal 22px/0 FontAwesome;
  top: 0;
  width: 1.5em;
  height: 1.5em;
  margin: 0;
  background-color: rgba(0, 0, 0, 0.2);
  color: transparent;
  transition: all 0.3s ease;
}
.slick-slider:hover .slick-prev,
.slick-slider:hover .slick-next {
}
.slick-prev:hover,
.slick-prev:focus,
.slick-next:hover,
.slick-next:focus {
  background-color: rgba(0, 0, 0, 0.8);
}
.slick-prev:hover:before,
.slick-prev:focus:before,
.slick-next:hover:before,
.slick-next:focus:before {
}
.slick-prev.slick-disabled:before,
.slick-next.slick-disabled:before {
}
.slick-prev:before,
.slick-next:before {
  font-family: inherit;
  font-size: inherit;
  display: inline-block;
  opacity: 1;
  color: rgba(255, 255, 255, 0.8);
}
.slick-prev {
  left: 0;
}
.slick-prev:before {
  content: "\f053";
}
.slick-next {
  right: 0;
}
.slick-next:before {
  content: "\f054";
}
.slick-dots li button:hover,
.slick-dots li button:focus {
}
.slick-dots li button:hover:before,
.slick-dots li button:focus:before {
}
.slick-dots li button:before {
}
.slick-dots li.slick-active button:before {
}
/* Slick slider: Content */
.slick-slide {
}
.slick-slide a {
  position: relative;
  display: block;
  text-decoration: none;
}
.slick-slide h2 {
  font-size: 22px;
  font-weight: bold;
  margin: 0 auto;
  background-color: #fff;
  position: relative;
  overflow: hidden;
  color: #333;
  padding: 0.5em;
  width: 80%;
  margin-top: -7%;
}
.slick-slide .thumbnail:after {
  content: "";
  position: absolute;
  width: 1px;
  height: 100%;
  right: 0;
  top: 0;
  background-color: rgba(128, 128, 128, 0.66);
}

/* Custom cursor */

.parent {
  position: relative;
  overflow: hidden;
/*   cursor: none; */
}

.follower {
  width: 4rem;
  height: 4rem;
  border-radius: 100%;
  overflow: hidden;
  position: absolute;
  background-color: red;
  left: 0;
  z-index: 3;
  top: 0;
  pointer-events: none; /* Very important to prevent the follower from messing up with the mouse move */
/*   transition: opacity 0.2s ease-in-out; */
  
  
  background: rgba(0,0,255,0.25);
  border: 4px solid black;
  will-change: transform;
}

.follower > * {
  margin: auto;
}
!

JS 

              
                console.clear();

myCoolSlider();

var mouseOverElements = document.querySelectorAll(".mouseOver");
var followers = [];

for (var i = 0; i < mouseOverElements.length; i++) {
  followers.push(createFollower(mouseOverElements[i]));
}

window.addEventListener("resize", invalidateFollowers);
window.addEventListener("scroll", invalidateFollowers);

function invalidateFollowers() {
  
  for (var i = 0; i < followers.length; i++) {
    followers[i].bounds = null;
  }
}

function createFollower(parent) {
  
  var requestId = null;
  
  var follower = parent.querySelector(".follower");
    
  var mouse = {
    bounds: null,
    x: 0,
    y: 0
  };
  
  TweenLite.set(follower, {
    xPercent: -50,
    yPercent: -50
  });
  
  parent.addEventListener("mousemove", onMouseMove);
  
  function onMouseMove(event) {
    
    if (mouse.bounds == null) {
      mouse.bounds = parent.getBoundingClientRect();
    }
    
    mouse.x = event.clientX - mouse.bounds.left;
    mouse.y = event.clientY - mouse.bounds.top;
    
    if (!requestId) {
      requestId = requestAnimationFrame(updateFollower);
    }
  }
    
  function updateFollower() {
    
    TweenLite.to(follower, 0.3, {
      x: mouse.x,
      y: mouse.y
    });
        
    requestId = null;
  }
  
  return mouse;
}




























/*Slider function [It is recommended to place a function in a separate JS file, such as "functions.js"]*/
function myCoolSlider() {
        $('#featured-content').slick({
            dots: false,
            infinite: true,
            speed: 300,
            slidesToShow: 4,
            slidesToScroll: 4,
            responsive: [{
                breakpoint: 1200,
                settings: {
                    slidesToShow: 4,
                    slidesToScroll: 4,
                    infinite: true,
                    dots: true
                }
            }, {
                breakpoint: 992,
                settings: {
                    slidesToShow: 3,
                    slidesToScroll: 3
                }
            }, {
                breakpoint: 768,
                settings: {
                    slidesToShow: 3,
                    slidesToScroll: 3
                }
            }, {
                breakpoint: 480,
                settings: {
                    slidesToShow: 2,
                    slidesToScroll: 2
                }
            }]
        });
    }
!
999px

Console