Edit in JSFiddle

var $animation_elements = $('.animation-element');
var $window = $(window);

function check_if_in_view() {
  var window_height = $window.height();
  var window_top_position = $window.scrollTop();
  var window_bottom_position = (window_top_position + window_height);

  $.each($animation_elements, function() {
    var $element = $(this);
    var element_height = $element.outerHeight();
    var element_top_position = $element.offset().top;
    var element_bottom_position = (element_top_position + element_height);

    //check to see if this current container is within viewport
    if ((element_bottom_position >= window_top_position) &&
      (element_top_position <= window_bottom_position)) {
      $element.addClass('in-view');
    } else {
      $element.removeClass('in-view');
    }
  });
}

$window.on('scroll resize', check_if_in_view);
$window.trigger('scroll');

<div class="main-container">
  <div class="container cf">

    <!-- Box  -->
    <div class="animation-element box bounce-up cf">
      <div class="subject design">
        <div class="category-color"></div>

        <h3 class="title">Example box</h3>
        <div class="content">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus eu lacinia mi, non luctus purus. Pellentesque non erat vitae ligula tincidunt consequat. Integer ac risus massa.</div>
        <div class="enrole">Bla bla blah</div>
      </div>
    </div>
  
  </div>

/*These styles contain basic styles for fomatting along with our animation css*/

body {
  font-size: 16px;
  font-family: 'Open Sans', sans-serif;
  font-weight: 400;
  background: #efefef;
  line-height: 170%;
}

*,
*:before,
*:after {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}


/*clearfixes*/

.cf:before,
.cf:after {
  content: " ";
  display: table;
}

.cf:after {
  clear: both;
}

.main-container {
  background: #fff;
  max-width: 1000px;
  min-height: 3000px;
  margin: 25px 25px auto;
  position: relative;
}

.container {
  position: relative;
  padding: 25px;
}


.box {
  margin-top: 1000px;
}
/*animation element*/

.animation-element {
  position: relative;
  width: 30%;
  margin: 0% 1.33 2.66% 1.33%;
  float: left;
}


/*bounce up animation for the subject*/

.bounce-up .subject {
  opacity: 0;
  -moz-transition: all 700ms ease-out;
  -webkit-transition: all 700ms ease-out;
  -o-transition: all 700ms ease-out;
  transition: all 700ms ease-out;
  -moz-transform: translate3d(0px, 200px, 0px);
  -webkit-transform: translate3d(0px, 200px, 0px);
  -o-transform: translate(0px, 200px);
  -ms-transform: translate(0px, 200px);
  transform: translate3d(0px, 200, 0px);
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  backface-visibility: hidden;
}

.bounce-up.in-view .subject {
  opacity: 1;
  -moz-transform: translate3d(0px, 0px, 0px);
  -webkit-transform: translate3d(0px, 0px, 0px);
  -o-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  transform: translate3d(0px, 0px, 0px);
}

.subject {
  float: left;
  width: 100%;
  margin: 0% 1.33% 2.66% 1.33%;
  background: #F5F5F5;
  padding: 15px;
  box-shadow: 0px 1px 1px 0px rgba(0, 0, 0, 0.2);
  border: solid 1px #EAEAEA;
}

x-shadow: 0px 2px 6px 0px rgba(0, 0, 0, 0.25);
}

.subject .header {
  margin: 8px 0px;
}

.subject .header .date,
.subject .header .category {
  margin: 0px;
  clear: none;
  width: 50%;
}

.subject .header .date i,
.subject .header .category i {
  margin-right: 5px;
  color: #333;
  -moz-transition: all 400ms linear;
  -webkit-transition: all 400ms linear;
  -o-transition: all 400ms linear;
  transition: all 400ms linear;
}

.subject .header .date {
  float: left;
  text-align: left;
}

.subject .header .category {
  float: right;
  text-align: right;
}


/*subject icon at top*/

.subject .icon {
  position: absolute;
  top: -20px;
  left: 50%;
  left: calc(50% - 20px);
}

.subject .icon i {
  width: 40px;
  height: 40px;
  color: rgb(255, 255, 255);
  font-size: 150%;
  border-radius: 50%;
  text-align: center;
  padding: 7px;
}


/*Category color / icon color*/

.subject .category-color {
  height: 7px;
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
}

.subject.design .category-color,
.subject.design .icon i {
  background: #c0392b;
}

.subject.development .category-color,
.subject.development .icon i {
  background: #16a085;
}

.subject.photography .category-color,
.subject.photography .icon i {
  background: #2980b9;
}


/*hovering over subject*/

.subject.development:hover .header i {
  color: #16a085;
}

.subject.design:hover .header i {
  color: #c0392b;
}

.subject.photography:hover .header i {
  color: #2980b9;
}

.subject .title {
  margin: 12px 0px;
  border-bottom: dashed 1px #ccc;
  padding-bottom: 10px;
}

.subject .content {
  margin-bottom: 8px;
}

.subject .enrole {
  position: relative;
  color: #333;
  padding: 5px 12px;
  cursor: pointer;
  float: right;
  display: inline-block;
  border: solid 1px #ccc;
  -moz-transition: all 400ms linear;
  -webkit-transition: all 400ms linear;
  -o-transition: all 400ms linear;
  transition: all 400ms linear;
}