* {
    margin: 0px;
    box-sizing: border-box;
  }
  
  .thumb_gallery {
    cursor: pointer;
    margin-bottom: 30px;
  }
  
  .thumb_gallery:hover { opacity: 0.8; }
  
  #background_overlay {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0, 0.9);
    z-index: 999;
    overflow: auto;
  }
  
  .container_img {
    position: relative;
    max-width: 1000px;
    max-height: 600px;
    margin: 2% auto;
    animation-name: zoom_image;
    animation-duration: 0.4s;
  }
  
  .con-ac-ar {
    width: 1000px;
    height: 600px;
    position: relative;
  }
  
  .closebtn {
    text-align: right;
    font-size: 2.5em;
    color: rgb(255, 255, 255);
    cursor: pointer;
  }
  
  .activePopUpImg {
    width: 1000px;
    height: 600px;
    padding: 2px;
    background-color: rgb(255, 255, 255);
    border-radius: 5px;
  }
  
  .previousImage, .nextImage {
    color: #fff;
    font-size: 2.5em;
    cursor: pointer;
    opacity: 0;
    width: 80px;
    text-align: center;
  }
  
  .previousImage {
    position: absolute;
    line-height: 600px;
    top: 0;
    left: 0;
    bottom: 0;
  }
  
  .nextImage {
    position: absolute;
    line-height: 600px;
    top: 0;
    right: 0;
    bottom: 0;
  }
  
  .previousImage:hover {
    opacity: 1;
    transition: 0.2s;
  }
  
  .nextImage:hover {
    opacity: 1;
    transition: 0.4s;
  }
  @keyframes
  zoom_image {  from {
    transform: scale(0.5)
  }
  
    to { transform: scale(1) }
  }
  @media screen and (min-width: 650px) and (max-width: 1100px) {
  
    .container_img {
      width: 100%;
      height: 500px;
    }
  
    .con-ac-ar {
      width: 100%;
      height: 500px;
    }
  
    .activePopUpImg {
      width: 100%;
      height: 500px;
    }
  
    .previousImage, .nextImage { line-height: 500px; }
  }
  @media screen and (min-width: 351px) and (max-width: 649px) {
  
    .container_img {
      width: 100%;
      height: 400px;
    }
  
    .con-ac-ar {
      width: 100%;
      height: 400px;
    }
  
    .activePopUpImg {
      width: 100%;
      height: 400px;
    }
  
    .previousImage, .nextImage { line-height: 400px; }
  }
  @media screen and (max-width: 350px) {
  
    .container_img {
      width: 100%;
      height: 300px;
    }
  
    .con-ac-ar {
      width: 100%;
      height: 300px;
    }
  
    .activePopUpImg {
      width: 100%;
      height: 300px;
    }
  
    .previousImage, .nextImage { line-height: 300px; }
  }