body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}

header {
    text-align: center;
    background-color: #007bff;
    color: white;
    padding: 20px;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

section {
    background: white;
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input, button {
    display: block;
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #007bff;
    color: white;
    cursor: pointer;
}

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

#rooms-list {
    list-style: none;
    padding: 0;
}

#rooms-list li {
    padding: 10px;
    border: 1px solid #ccc;
    margin: 5px 0;
    cursor: pointer;
}

#rooms-list li:hover {
    background-color: #f0f0f0;
}

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