.darkbox[id] {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
  background: rgba(0,0,0,.8);
  z-index: 100;
  transition: opacity 1.2s cubic-bezier(0,0,0,1);
}

.darkbox[id]:target {
  opacity: 1;
  pointer-events: auto;
}

.darkbox[id]:target a {
  position: fixed;
  z-index: 100;
  width: 100%;
  height: 100%;
}

.darkbox div {
  position: relative;
  display: block;
  max-width: 90%;
  max-height: 90%;
  margin: 5% 5%;
  padding: 0;
  text-align: center;
}

.darkbox div div {
  position: relative;
  display: inline-block;
  max-width: 99%;
  max-height: 99%;
  margin: 0 auto;
  padding: 0;
  text-align: center;
  border: 15px solid #fff;
  background-color: #fff;
  box-shadow: 0 1px 8px #000;
}

.darkbox div div img {
  display: block;
  max-width: 90%;
  max-height: 90%;
  margin-left: auto;
  margin-right: auto;
  padding: 0;
}