Flexbox doesnt recognize second element

Hello there!

Sorry, this is a css-question, not really wordpress related
but I couldn’t find a good css-forum…
So Im new to flexbox and trying to realise a simple layout, where
my list of articles begins under my slider, but the second element
(my list of articles) seems to not be a direct child of my flex
although in the html its just the slider and the articles each in
their own div and the whole thing inside my flex-div

Here’s the html:

<div class="lay-main" >
			
		 	<div class="myslider">
        	<?php get_template_part('template-parts/content/content', 'slider' ); ?>
     		</div>	
		
		 	<div class="article-excerpt">
		 	<?php get_template_part('template-parts/content/content', 'short-article' ); ?> 
     		</div>
		 </div>

and here’s the css:

.lay-main{
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
}

The page I need help with: [log in to see the link]