.bigimg {
  width: auto;
  max-width: 1200px;
  max-height: 90vh;
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  display: none;
  z-index: 9999;
  border: 10px solid #fff;
}

.mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000;
  opacity: 0.8;
  filter: Alpha(opacity=50);
  z-index: 9990;
  transition: all 1s;
  display: none;
  cursor: pointer
}