.modal {
  display: none;
  position: fixed;
  z-index: 0.9;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: black;
  background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
  background-color: #fefefe;
  margin: 120px auto auto auto;
  padding: 20px;
  border: 1px solid #888;
  min-width: 40%;
  text-align: center;
}