body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}

.app {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.screen {
    display: none;
    text-align: center;
}

.active {
    display: block;
}

.messages {
    max-height: 300px;
    overflow-y: auto;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
}

.message {
    margin: 5px;
    padding: 8px;
    border-radius: 10px;
}

.my-message {
    background-color: #007bff;
    color: #fff;
    align-self: flex-end;
}

.other-message {
    background-color: #28a745;
    color: #fff;
    align-self: flex-start;
}

.update {
    font-style: italic;
    color: #888;
}

input[type="text"],
button {
    margin-top: 10px;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    cursor: pointer;
    background-color: #007bff;
    color: #fff;
    border: none;
}

button:hover {
    background-color: #0056b3;
}

input[type="text"]::placeholder {
    color: #aaa;
}