A novice at the front end, who knows about html and css for about a month and a half, wants to ask the gods to take a look at it. There is such a page as the first screen, text plus pictures, the first half of the text is fixed, the second half is typewriter effect, and the text content will change.
scroll down the screen, the picture in the first screen scrolls down with the screen, until the specified box in the second picture, it continues to be fixed, the screen continues to scroll down, and the position of the picture does not move, but if it scrolls up, the picture scrolls up again.
I would like to ask which technology applications need to be involved in order to achieve this effect, so that I can learn some knowledge in this area. Thank you.