.fade {
  transition: opacity 0.3s;
}

.modal-container {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0, 0, 0); /* Fallback color */
  background-color: rgba(0, 0, 0, 0.4); /* Black w/ opacity */
}

.modal {
  margin: 15% auto; /* 15% from the top and centered */
  padding: 20px;
  width: 80%; /* Could be more or less, depending on screen size */
}