body {
  font-family: Arial, sans-serif;
  margin: 20px;
}
textarea {
  width: 100%;
  height: 150px;
}
button {
  margin: 10px 0;
  padding: 10px;
  cursor: pointer;
}
.valid {
  color: green;
}
.invalid {
  color: red;
}

.warning {
  color: goldenrod;
  font-style: italic;
  margin-top: -10px;
  margin-bottom: 10px;
}

.mandatory {
  color: red;
  font-weight: bold;
}

.semimandatory {
  color: #ffa800;
  font-weight: bold;
}

.optional {
  color: green;
  font-weight: bold;
}

.red {
  font-weight: bold;
  color: red;
}

.amber {
  font-weight: bold;
  color: #ffa800;
}

.green {
  font-weight: bold;
  color: green;
}