/* body {
  margin: 1em;
} */

.active a {
  color: red;
  font-weight: bold;
}

.popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 20%;
  max-height: 50%;
}
.popup img {
  max-width: 100%;
  max-height: 100%;
}
.close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  cursor: pointer;
}