How to make border-bottom the entire length of the page?

Question

css

The container has a width of 1170px, and I want to make it the entire width of the page, but it does not go out, and because it is a child element. What should I do?

Answer 1

you make a block with border-bottom at the break point, and then put before and after it with the same border and the width is just as much as you need so that it is full width

Answer 2

I'm not special, but try to make the line full width and position it as absolute, according to the relative property of the parent