#age-verify {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
}
.window {
  background: #fff;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}
.hidden {
  display: none;
}
.underBox {
  display: none;
}
.under .underBox {
  display: block;
}
.under .yes, .under .no {
  display: none;
}