body {
    width: 100%;
    height: 100vh;
    margin: 0;
    background:linear-gradient(white,#009688);
    color: black;
    font-family: Tahoma;
    font-size: 16px;
  }
  
  h1,h2, p {
    margin: 1em auto;
    text-align: center;
  }
  
  form {
    width: 450px;
    max-width: 500px;
    min-width: 300px;
    margin: 0 auto;
    padding-bottom: 2em;
  }

  
  input{
    margin: 10px 0 0 0;
    width: 100%;
    min-height: 2em;
    background-color: #009688;
    border: 1px solid #009688;
    color: #ffffff;
  }
  button {
    display: block;
    width: 60%;
    margin: 1em auto;
    height: 2em;
    font-size: 1.1rem;
    background-color: #009688;
    border-color: white;
    min-width: 300px;
  }