Why does the block slide down when opening the menu?

Question

css

https://jsfiddle.net/2ydsfs5j/
How to make a dropdown menu not affect the rest of the page content?

Answer 1

position: relative;
The element depends on the position of the previous block, i.e. the previous element increases the height - the current element moves. Alternatively, give a height to the previous element (.b-page__line).