*{
  box-sizing:  border-box;
}
button{
  background-image:  linear-gradient();
  border-radius: 10px;
  border: 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 3);
  color: black;
  cursor: pointer;
  padding: 10px 25px;
}
button:active {
  opacity: 0.8;
}
.modal{
  opacity: 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  transition: all 0.3 ease-in-out;
  z-index: -1;

  display: flex;
  align-items: center;
  justify-content: center;
}

.modal.open {
  opacity: 1;
  z-index: 999;
}
.modal-inner{
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 3);
  padding: 15px 25px;
  text-align: center;
  width: 380px;
}
.modal-inner h2 {
  margin: 0;
}
.modal-inner p{
  line-height: 24px;
  margin: 10px 0;
}