.bg-gra-02 {
  background: url(https://www.3cservices.com.br/wp-content/uploads/2018/08/Energias-Fotovoltaicas.jpg);
  background-size: cover;
  background-attachment: fixed;
}
button:disabled,
  button[disabled],
  button[disabled]:active,
  button[disabled]:hover {
    opacity: .3;
    background-color: #cccccc;
    color: #666666;
  }

  .card {
    -moz-transition: width 1s ease-in-out, left 1.5s ease-in-out;
    -webkit-transition: width 1s ease-in-out, left 1.5s ease-in-out;
    -moz-transition: width 1s ease-in-out, left 1.5s ease-in-out;
    -o-transition: width 1s ease-in-out, left 1.5s ease-in-out;
    transition: width 1s ease-in-out, left 1.5s ease-in-out;
  }

  .invalid,
  .warning {
    color: red;
  }

  .success {
    color: green;
  }

  .input-group {
    margin: 50px 0;
  }
  .card {
    padding: 20px 0 10px;
  }
  .card-4 .card-body {
    padding-bottom: 50px;
  }
  .header-logo {
    max-width: 200px;
    display: block;
    margin-bottom: 40px;
  }
  .footer-logo {
    margin-top: 50px;
    max-width: 130px;
    display: block;
    opacity: .4;
  }