body {
  display: grid;  
  background: lightseagreen;
  text-align: center; 
  padding: 10px; 
  font-size: 1.2em;
}

main {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 10px;
}

hr {
  margin: 1.2em 0;
}

input, button {
  font-size: 1.2rem;
}

input {
  width: 40%;
  margin: 0 20px;
}