body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

header {
    background-color: #4A90E2;
    color: white;
    padding: 10px 20px;
    text-align: center;
}

.container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #2C3E50;
    color: white;
    padding: 15px;
}

.chat {
    flex: 1;
    background-color: white;
    padding: 15px;
    overflow-y: auto;
}

.message {
    margin: 10px 0;
}

.input-area {
    display: flex;
    margin-top: 10px;
}

.input-area input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.input-area button {
    padding: 10px;
    background-color: #4A90E2;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.input-area button:hover {
    background-color: #357ABD;
}