.modal {
  display: none;
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
}

.modal-content {
  background: #fff;
  margin: 15% auto;
  padding: 20px;
  width: 300px;
  text-align: center;
  border-radius: 10px;
}

.close {
  float: right;
  cursor: pointer;
  font-size: 20px;
}