.popup{
    width: 900px;
    margin: auto;
    text-align: center
}
.popup img{
    width: 200px;
    height: 200px;
    cursor: pointer
}
.show{
    z-index: 999;
    display: none;
}
.show .overlay{
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,.66);
    position: absolute;
    top: 0;
    left: 0;
}
.show .img-show{
    width: 600px;
    height: 400px;
    background: #FFF;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    overflow: hidden
}
.img-show span{
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 99;
    cursor: pointer;
}
.img-show img{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: Raleway;
    background-color: #202125;
  }
  
  .heading {
      text-align: center;
      font-size: 2.0em;
      letter-spacing: 1px;
      padding: 40px;
      color: white;
  }
  
  .gallery-image {
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .gallery-image img {
    height: 250px;
    width: 350px;
    transform: scale(1.0);
    transition: transform 0.4s ease;
  }
  
  .img-box {
    box-sizing: content-box;
    margin: 10px;
    height: 250px;
    width: 350px;
    overflow: hidden;
    display: inline-block;
    color: white;
    position: relative;
    background-color: white;
  }
  
  .caption {
    position: absolute;
    bottom: 5px;
    left: 20px;
    opacity: 0.0;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  
  .transparent-box {
    height: 250px;
    width: 350px;
    background-color:rgba(0, 0, 0, 0);
    position: absolute;
    top: 0;
    left: 0;
    transition: background-color 0.3s ease;
  }
  
  .img-box:hover img { 
    transform: scale(1.1);
  }
  
  .img-box:hover .transparent-box {
    background-color:rgba(0, 0, 0, 0.5);
  }
  
  .img-box:hover .caption {
    transform: translateY(-20px);
    opacity: 1.0;
  }
  
  .img-box:hover {
    cursor: pointer;
  }
  
  .caption > p:nth-child(2) {
    font-size: 0.8em;
  }
  
  .opacity-low {
    opacity: 0.5;
  }
