body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    text-align: center;
}
.menu button {
    padding: 10px 15px;
    margin: 5px;
    cursor: pointer;
}
.content {
    display: none;
    background: white;
    padding: 20px;
    margin: 20px auto;
    width: 60%;
    border-radius: 8px;
}
.letters button {
    margin: 4px;
    padding: 8px 12px;
}
input, textarea {
    padding: 8px;
    width: 60%;
}