How to push a child element to the edge of the parent?

Question

css

I need to push the very last block with icons to the bottom of the parent element. The parent element I'm setting display: flex;is <div class="wrapper_two-blocks">(it includes <div class="content_block">and <div class="footer_block">). In order to pinch the bottom block with icons (I have it <div class="footer_block">), I ask <div class="content_block"> flex: 1 0 auto;

Can I fail to pin the box due to the fact that it is itself <div class="footer_block">the parent of flex items (in its CSS display:flex;).

Answer 1

second_block has a minimum height of 360px.
The content of its child blocks is not enough to fill those 360px.
=> wrapper_two-blocks doesn't reach the bottom of the parent.

In order to press the bottom block with icons (I have it <div class="footer_block">), I set<div class="content_block"> flex: 1 0 auto;

You are asking the wrong block.
Frame the blocks to understand who is the parent of whom and what size.