.banner{
  text-align: center;
}

form {
    max-width: 20rem;
    padding: 0 0.25rem;
    margin: auto;
    display: flex;
    flex-direction: column;
    margin-bottom: 2em;
  }

  form input {
    font-size: 1.2rem;
    margin: 0.25rem;
    border-radius: 0.25rem;
    outline: none;
    border: 1px solid #999;
  }

  form input[type='submit'] {
    background-color: palegreen;
  }

  .shortprompt {
    height: 1rem;
    font-size: 1.2rem;
    margin: 0.25rem;
    border-radius: 0.25rem;
    font-size: 0.7rem;
    text-align: center;
  }