body{
  background-color: #f5f5f5;
}
.card {
  background: rgb(255, 254, 254);
  border-radius: 10px;
  box-shadow: rgba(50, 50, 93, 0.25) 0px 6px 12px -2px, rgba(0, 0, 0, 0.3) 0px 3px 7px -3px;

}
main{

  margin-top: 100px;
  padding: 30px;
}
.result{
  padding: 10%;
  margin-top: 10%;
  opacity: 0;
  transition: all 0.5s !important;

}
.payment{
  color: deepskyblue;
  font-size: 70px;
}
h2{
  text-align: center;
}
.show{
  opacity: 1 !important;
}
.is-invalid{
  border-color: salmon !important;
}