title: How could I make embedded videos thumbnail automatically in HTML/CSS/JAVASCRIPT
body: <p>I'm basically new to coding, right now I'm studying web design at university and they gave us this homework where we have to create a website like youtube with a large amount of videos +200 (idk why it couldn't be 10 videos)</p>
  <p>Right now I'm facing this problem of thumbnails, I really want it to look good, and have responsive thumbnails such as youtube, where you can put the mouse over the video's thumbnail and it will play a part of it.</p>
  <p>I'm using  for videos, and for the right-bar how could I place the videos thumbnails as I said before.
  Since it will be a large amount of videos I don't feel like making a gif, or a personalized video for each video, is there a way I can automate this?</p>