body {
    font-family: 'Arial', 'Times New Roman', serif;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    font-size: 16px;
    color: #333;
    background: #f5f5f5;
}

.letter {
    background: white;
    padding: 40px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.title {
    text-align: center;
}

h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

h3 {
    font-size: 16px;
    margin-bottom: 5px;
    font-weight: normal;
}

hr {
    border: none;
    border-top: 1px solid #ccc;
    margin: 20px 0;
}

p {
    text-align: justify;
    margin-bottom: 20px;
}

a {
    color: #0066cc;
    text-decoration: none;
}

.floating-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #0b1220;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    text-align: center;
    line-height: 50px;
    font-size: 24px;
    text-decoration: none;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease;
    z-index: 1000;
}

.floating-btn:hover {
    background-color: #1a1f3a;
}