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HTML 

              
                <html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <title>photo show</title>
  <link rel="stylesheet" href="normalize.css" type="text/css">
  <link rel="stylesheet" href="myStyles.css" type="text/css">
  <link href="https://fonts.googleapis.com/css?family=Courgette" rel="stylesheet">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
</head>

<body>
  <h1>See the gallery by clicking on the windows</h1>
  <div class="wrapper">
    <div class="box item-1"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img1.jpg" alt="">
      <div class="overlay ovrl-left ovrl-1"></div>
      <div class="overlay ovrl-right ovrl-1"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-2"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img2.jpg" alt="">
      <div class="overlay ovrl-left ovrl-2"></div>
      <div class="overlay ovrl-right ovrl-2"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-3"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img3.jpg" alt="">
      <div class="overlay ovrl-left ovrl-3"></div>
      <div class="overlay ovrl-right ovrl-3"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-4"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img4.jpg" alt="">
      <div class="overlay ovrl-left ovrl-4"></div>
      <div class="overlay ovrl-right ovrl-4"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-5"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img5.jpg" alt="">
      <div class="overlay ovrl-left ovrl-5"></div>
      <div class="overlay ovrl-right ovrl-5"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-6"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img6.jpg" alt="">
      <div class="overlay ovrl-left ovrl-6"></div>
      <div class="overlay ovrl-right ovrl-6"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-7"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img7.jpg" alt="">
      <div class="overlay ovrl-left ovrl-7"></div>
      <div class="overlay ovrl-right ovrl-7"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-8"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img8.jpg" alt="">
      <div class="overlay ovrl-left ovrl-8"></div>
      <div class="overlay ovrl-right ovrl-8"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>
    <div class="box item-9"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/740816/img9.jpg" alt="">
      <div class="overlay ovrl-left ovrl-9"></div>
      <div class="overlay ovrl-right ovrl-9"></div>
      <div class="locker"><i class="arrow fa fa-arrows-h" aria-hidden="true"></i></div>
    </div>

  </div>
  <a href="http://tomdevelopment.com">
    <p>www.tomdevelopment.com</p>
  </a>

</body>
!

CSS 

              
                body {
  background: #3494E6; /* fallback for old browsers */ /* Chrome 10-25, Safari 5.1-6 */
  background: -webkit-gradient(
    linear,
    left top, right top,
    from(#EC6EAD),
    to(#3494E6)
  );
  background: linear-gradient(
    to right,
    #EC6EAD,
    #3494E6
  ); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  text-align: center;
  color: #fff;
}

a {
  color: #ccc;
  text-decoration: none;
}

h1 {
  font-family: 'Courgette', cursive;
  color: #0D5212;
}

.wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  max-width: 90%;
  margin: 20px auto 0;
}

.box {
  -webkit-box-flex: 1;
      -ms-flex: 1 1 25%;
          flex: 1 1 25%;
  margin: 50px 10px 10px 25px;
  position: relative;
}
img {
  width: 280px;
  height: 200px;
  -webkit-box-shadow: 0px 0px 15px -1px rgba(0, 0, 0, 0.75);
  box-shadow: 0px 0px 15px -1px rgba(0, 0, 0, 0.75);
}

.overlay {
  position: absolute;
  margin: 0;
  top: 0;
  height: 200px;
  z-index: 98;
  background: rgba(13, 82, 137, 1);
}

.ovrl-left {
  width: 160px;
  left: 50%;
  -webkit-box-shadow: 9px 0px 19px 0px rgba(105, 109, 122, 1);
  box-shadow: 9px 0px 19px 0px rgba(105, 109, 122, 1);
  border-left: 0.5px solid rgba(255, 255, 255, 0.8);
}

.ovrl-right {
  width: 160px;
  right: 50%;
  -webkit-box-shadow: -9px 0px 19px 0px rgba(105, 109, 122, 1);
  box-shadow: -9px 0px 19px 0px rgba(105, 109, 122, 1);
}

.locker {
  position: absolute;
  height: 20px;
  width: 20px;
  background: #fff;
  top: 43%;
  left: 48%;
  border: 1px solid rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  z-index: 99;
  -webkit-transition: all 0.5s ease;
  transition: all 0.5s ease;
}

i.arrow {
  font-size: 0.8em;
  color: #bcbcbc;
}

.move-right {
  -webkit-animation-name: myRight;
          animation-name: myRight;
  -webkit-animation-duration: 0.5s;
          animation-duration: 0.5s;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}

.move-left {
  -webkit-animation-name: myLeft;
          animation-name: myLeft;
  -webkit-animation-duration: 1.3s;
          animation-duration: 1.3s;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}

@-webkit-keyframes myRight {
  0% {
    left: 50%;
    opacity: 1;
  }
  100% {
    left: 80%;
    opacity: 0;
    display: none;
  }
}

@keyframes myRight {
  0% {
    left: 50%;
    opacity: 1;
  }
  100% {
    left: 80%;
    opacity: 0;
    display: none;
  }
}

@-webkit-keyframes myLeft {
  0% {
    right: 50%;
    opacity: 1;
  }
  100% {
    right: 80%;
    opacity: 0;
    display: none;
  }
}

@keyframes myLeft {
  0% {
    right: 50%;
    opacity: 1;
  }
  100% {
    right: 80%;
    opacity: 0;
    display: none;
  }
}
!

JS 

              
                $(function() {
  $(".box").on("mousedown", function(e) {
    const gate = $(this).children("div");
    $(this).children(".locker").hide();
    for (var i = 0; i < gate.length; i++) {
      if ($(gate[i]).hasClass("ovrl-left")) {
        $(gate[i]).toggleClass("move-right");
      }
      if ($(gate[i]).hasClass("ovrl-right")) {
        $(gate[i]).toggleClass("move-left");
      }
    }
    // removes the click event after reveling the image
    $(this).off();
  });
});
!
999px

Console