body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: white;
    margin: 0 auto;
    width: 500px;
    border: 3px solid rgb(0,0,0);
    padding: 0 2em 1em;
}
h1, h3 {
    color: rgb(0, 0, 0);
}
div {
    margin-bottom: 1em;
}
label {
    display: inline-block;
    width: 10em;
    text-align: left;
}
input {
    margin-left: 1em;
    margin-right: 0.5em;
}
span {
    color: red;
}

@media (max-width: 600px) {
  body {
    padding: 30px;
    font-size: 1rem;
  }

  h1,h3 {
    font-size: 1.5rem;
    flex-direction: column;
    align-items: center;
  }
}

@media (min-width: 601px) and (max-width: 1024px) {
  body {
    padding: 60px;
    font-size: 1.1rem;
  }

  h1, h3 {
    font-size: 2rem;
  }
}