.img-wrapper {
  position: relative;
  margin-top: 15px;
 
}
 .img-wrapper img {
    width: 100%;
  }
.img-overlay {
  background: rgba(0,0,0,0.7);
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  
}

.img-overlay i {
    color: #fff;
    font-size: 3em;
  }

#overlay {
  background: rgba(0,0,0,0.7);
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999;
  // Removes blue highlight
  -webkit-user-select: none;
  -moz-user-select: none;    
  -ms-user-select: none; 
  user-select: none; 
  
}

#overlay img {
    margin: 0;
    width: 80%;
    height: auto;
    object-fit: contain;
    padding: 5%;
}

 @media screen and (min-width:768px) {
     #overlay img {
        width: 50%;
      }
}
 @media screen and (min-width:768px) {
     #overlay img {
        width: 60%;
      }
}
#nextButton {
  color: #fff;
  font-size: 2em;
  transition: opacity 0.8s;
  
}
 @media screen and (min-width:768px) {
   #nextButton{

    font-size: 3em;}
}
#nextButton:hover{opacity: 0.7;}
#prevButton {
  color: #fff;
  font-size: 2em;
  transition: opacity 0.8s;
  
  
}
@media screen and (min-width:768px) {
  #prevButton {
    font-size: 3em;
  }
}
#prevButton:hover{opacity: 0.7;}

#exitButton {
  color: #fff;
  font-size: 2em;
  transition: opacity 0.8s;
  position: absolute;
  top: 15px;
  right: 15px;
 
 
}

#exitButton:hover{
  opacity: 0.7;
}

 @media screen and (min-width:768px) {
  #exitButton {
    font-size: 3em;
  }
}