From what I've read, it's best to place an image using CSS when the image is not part of the content.

increase second arg in setTimeout() to increase unit of time

setTimeout()'s second argument is in milliseconds, so 1000 would be 1 second.

Can someone explain the trigonometry here?

w3schools also has some helpful examples.

Is the process of uploading a video to a site similar to uploading an image (like we did in project 2)?