.game-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    z-index: 1000;
}

.back-button {
    background: #4a5568;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
}

.back-button:hover {
    background: #2d3748;
}

.room-info {
    font-weight: bold;
}

.game-canvas {
    width: 100vw;
    height: 100vh;
    display: block;
    margin: 0;
    border: none;
}