body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    margin-top: 20px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 20px;
}

.message-board {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 20px;
    max-height: 400px;
    overflow-y: auto;
    background-color: #fafafa;
}

.message {
    padding: 10px;
    margin-bottom: 8px;
    background-color: #e9f7fe;
    border-left: 4px solid #2196F3;
    border-radius: 4px;
}

.message-content {
    flex-grow: 1;
}

.message-time {
    font-size: 0.8em;
    color: #666;
}

.message-form {
    display: flex;
    gap: 10px;
}

.message-form input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.message-form button {
    padding: 10px 20px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.message-form button:hover {
    background-color: #0b7dda;
}

.footer {
    text-align: center;
    margin-top: 5px;
    padding-top: 5px;
    border-bottom: 1px solid #eee;
    font-size: 0.9em;
    color: #666;
}

.footer a {
    color: #2196F3;
    text-decoration: none;
}