button {
  height: 2.5em;
  cursor: pointer;
}

#popup {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, .7);
  z-index: 1;
}

#popup.hide {
  display: none;
}

#popup.has-filter {
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

#popup .content {
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  box-shadow: 1px 1px 3px rgba(0, 0, 0, .3);
}