body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

#app {
    width: 100%;
    height: 100%;
}

.config-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #f0f0f0;
    padding: 20px;
    border-radius: 8px;
    display: none;
}

.show {
    display: block;
}