form {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}

form label {
  display: block;
  margin-top: 0px;
    font-weight: bold;
}

form input[type="text"],
form input[type="email"],
form textarea {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  margin-bottom: 5px;
  border: 2px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
  font-family: sans-serif;
}

form input[type="submit"] {
  display: block;
  width: 100%;
  padding: 10px;
  margin-top: 20px;
  background-color: #4CAF50;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  border: none;
  border-radius: 5px;
}

form .form-control.error input,
form .form-control.error textarea {
  border-color: #f44336;
}

form .form-control.error small {
  visibility: visible;
  color: #f44336;
  font-size: 14px;
}

form .form-control.success input,
form .form-control.success textarea {
  border-color: #4CAF50;
}

form .form-control.success small {
  visibility: hidden;
  color: #4CAF50;
  font-size: 14px;
}