.formulario {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    font-family: Arial, sans-serif;
}

.form-group {
    margin-bottom: 20px;
}

.formulario input,
.formulario textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

.formulario textarea {
    min-height: 150px;
    resize: vertical;
}

.error-message {
    color: #d9534f;
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.formulario input:invalid,
.formulario textarea:invalid {
    border-color: #d9534f;
}

.formulario input:valid,
.formulario textarea:valid {
    border-color: #5cb85c;
}

.button {
    margin-top: 20px;
}

.feedback-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 4px;
    display: none;
}

.feedback-message.success {
    background-color: #dff0d8;
    color: #3c763d;
    display: block;
}

.feedback-message.error {
    background-color: #f2dede;
    color: #a94442;
    display: block;
}