body {
    font-family: Arial;
    background: #eaf0f5;
}

.app {
    max-width: 600px;
    margin: 40px auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
}

input {
    width: 90%;
    padding: 12px;
    margin: 5px;
}

button {
    padding: 12px 20px;
    background: #1976d2;
    color: white;
    border: none;
}

#messages {
    height: 300px;
    border: 1px solid #ccc;
    overflow-y: auto;
    margin: 10px 0;
}