body {
    font-family: Tahoma, sans-serif;
    background-color: #e6ecf0;
    margin: 0;
    padding: 0;
}

.login-box {
    width: 300px;
    margin: 100px auto;
    background: #fff;
    padding: 20px;
    text-align: center;
    border-radius: 10px;
}

.chat-container {
    max-width: 700px;
    margin: 20px auto;
    background: #fefefe;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
}

.header {
    display: flex;
    justify-content: space-between;
    background: #0066cc;
    color: white;
    padding: 10px;
    border-radius: 6px;
}

.chat-box {
    height: 400px;
    overflow-y: scroll;
    background: #f4f4f4;
    padding: 10px;
    margin-top: 10px;
    border-radius: 6px;
    border: 1px solid #ddd;
}

#chat-form {
    display: flex;
    margin-top: 10px;
}

#chat-form input {
    flex-grow: 1;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #ccc;
}

#chat-form button {
    padding: 10px 15px;
    background: #0066cc;
    color: white;
    border: none;
    border-radius: 4px;
    margin-left: 5px;
    cursor: pointer;
}

.timestamp {
    font-size: 0.8em;
    color: #999;
}