.course-container {
  position: relative;
  margin-top: 50px;
  margin-left:20px;
  width: 500px;
  height: 300px;
  margin: 2px;
  float:left;
  box-shadow: 5px 8px 10px #262626;
  border-radius:5px 5px 5px 5px;
   
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0);
  transition: background 0.5s ease;
}

.course-container:hover .overlay {
  display: block;
  background: rgba(0, 0, 0, .3);
}

.course-img {
  position: absolute;
  width: 500px;
  height: 300px;
  left: 0;
}

.title {
  position: absolute;
  width: 500px;
  left: 0;
  top: 120px;
  font-weight: 700;
  font-size: 30px;
  text-align: center;
  text-transform: uppercase;
  color: white;
  z-index: 1;
  transition: top .5s ease;
  text-shadow: horizontal-offset vertical-offset blur color;
  text-shadow: 2px 4px 3px darkgreen /*rgba(0 , 0, 0 , 0.3)*/;
}

.course-container:hover .title {
  top: 90px;
}

.button_layer {
  position: absolute;
  width: 500px;
  left:0;
  top: 180px;
  text-align: center;
  opacity: 0;
  transition: opacity .35s ease;
}

.button_layer a {
  width: 200px;
  padding: 12px 48px;
  text-align: center;
  color: white;
  border: solid 2px white;
  z-index: 1;
}

.course-container:hover .button_layer {
  opacity: 1;
}

/*************************************************
* Filtering Prgrammes
*************************************************/

.filterDiv {
 
  width: 100%;
  height: 100%;
  line-height: 100px;
  text-align: center; 
  overflow: hidden;
  background-color: inherit;
  float:left;
  

  
  
  
}
.show {
  display: block;

}