body {
    font-family: Arial, sans-serif;
    margin: 40px;
}
textarea, input {
    width: 100%;
    padding: 8px;
    margin: 5px 0 15px;
}
button {
    padding: 10px 20px;
    font-size: 16px;
}
#smsInfo {
    font-weight: bold;
    color: #007700;
}