body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.chat-container {
    width: 400px;
    max-width: 100%;
    background: #ffffff;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

.chat-box {
    height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    margin-bottom: 10px;
}

#user-input {
    width: calc(100% - 80px);
    padding: 10px;
}

button {
    width: 60px;
    padding: 10px;
}