body {
    font-family: Arial, sans-serif;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

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

label {
    display: block;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 10px;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
    border-color: #3f51b5;
}

input[type="text"][data-error],
input[type="email"][data-error] {
    border-color: red;
}

.error-message {
    color: red;
}

.form-message {
    font-weight: bold;
    margin-top: 10px;
}