May I ask what tool was used to add the numbers on this picture?_html/css_WEB-ITnose

What tool was used to add the numbers on this picture? And it is yellow.
How to add it, please tell me in detail?

Reply to the discussion (solution)

You can make div

Let me tell you a way and you can figure it out yourself

OK2

The poster can refer to
http://www.w3school.com.cn/css/pr_class_position.asp

I will tell you a way and you can think about it yourself

Which 2 should be It's a small picture, right? It can be done using the position positioning attribute