*::after,::before {
  margin: 0;
  padding: 0;
  box-sizing: 0;
}
.container {
  padding: 20px 3.5rem;
  margin: 100px auto;
  width: 50%;
  height: 50vh;
  border-radius: 4px;
  box-shadow: 0 0 2rem 0 rgba(1, 1, 1, 0.6);
  text-align: center;
}
main #zero {
  font-size: 4rem;
  font-weight: bold;
}
main .bttn {
  text-align: center;
  margin-top: 3rem;
}
button {
  padding: 0.5rem 16px;
  border-style: none;
  border-radius: 4px;
  cursor: pointer;
}