.letter-box {
    max-width: 320px;
    padding: 20px;
    margin: 20px auto;
    background: #ffffff;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 18px rgba(0,0,0,0.1);
    font-family: Arial, sans-serif;
}

.letter-box h2 {
    margin-bottom: 15px;
}

.letter-display {
    font-size: 72px;
    font-weight: bold;
    margin: 20px 0;
    padding: 30px 0;
    background: #f5f5f5;
    border-radius: 10px;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.1);
}

.letter-options {
    margin-bottom: 15px;
    text-align: left;
}

.letter-options label {
    display: block;
    margin-bottom: 5px;
    font-size: 15px;
}

#generateLetter {
    padding: 10px 20px;
    background: #0073ff;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

#generateLetter:hover {
    background: #005ad1;
}