yt-custom-player/src/YouTubeVideo/Controls/FullscreenButton/styles.css

> A library for styling and customizing the YouTube player in React.

.fullscreen {
    display: flex;
}

.fullscreen-button {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
  
.fullscreen-button:hover {
    color: #ddd;
}