html, body {
    height: 100%;
    margin: 0;
    padding: 0;
  }
  
  .container, .form-container {
    width: 100vw;
    height: 100vh;
  }
  
  form {
    /* Let the form fill its parent container */
    width: 100%;
    height: 100%;
    box-sizing: border-box;
  }