body {
    margin: 0;
    padding: 0;
    color: rgba(255, 255, 255, 0.87);
    background-color: #0f0f0f;
}

#app {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

#fullscreen-toggle {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 10;
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.9);
    background: rgba(0, 0, 0, 0.45);
    cursor: pointer;
}