.popup {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: .6s;
  }
  .popup.is-show {
    opacity: 1;
    visibility: visible;
  }
  .popup-inner {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    width: auto;
    max-height: 100% !important;
    padding: 20px;
    background-color: #fff;
    z-index: 2;
  }
  .popup-inner img {
    max-height: 95vh !important;
    width: auto !important;
    max-width: 95vw !important;
  }
  .close-btn {
    position: absolute;
    right: 20px;
    top: 10px;
    width: 50px !important;
    height: 50px !important;
    line-height: 50px;
    text-align: right;
    cursor: pointer;
    z-index: 10000;
  }
  .close-btn i {
    font-size: 30px;
    color: #333;
    font-weight: normal !important;
  }
  .black-background {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,.8);
    z-index: 1;
    cursor: pointer;
  }