body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    height: 100%;
    overflow: hidden;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
}

#login-screen, #chat-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

#chat-screen {
    display: flex;
    width: 80%;
    height: 80%;
}

#room-list {
    width: 30%;
    border-right: 1px solid #ccc;
    padding: 10px;
    overflow-y: auto;
}

#chat-area {
    width: 70%;
    display: flex;
    flex-direction: column;
    padding: 10px;
}

#messages {
    flex-grow: 1;
    overflow-y: auto;
    margin-bottom: 10px;
}

input, button {
    margin: 5px 0;
    padding: 5px;
}

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

#rooms li {
    cursor: pointer;
    padding: 5px;
    margin: 2px 0;
    background-color: #f0f0f0;
    border-radius: 5px;
}

#rooms li:hover {
    background-color: #e0e0e0;
}