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HTML

CSS

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HTML

              
                mixin item(height)
	aside.aside
		.ad-container
			img(src="https://placehold.it/300x" + height + "?text=PUB")
		.aside-content
			- for (var i = 0; i < 10; ++i)
				p Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nobis quos minus earum, sed, sequi maxime repellendus repellat aliquid, obcaecati ex amet distinctio eveniet iusto. Autem, id ea magni veritatis excepturi.


.items
	.item
		h2 medium rectangle ad
		+item(300)
	.item
		h2 half page ad
		+item(600)
	.item.ad-block
		h2 no ad
		+item(300)

              
            
!

CSS

              
                // base
body
	min-height 100vh
	display flex
	justify-content center
	align-items center
.items
	display flex
.item
	h2
		font-family sans-serif
		font-weight 700
		text-transform uppercase
		margin-bottom 10px
	&:not(:last-child)
		margin-right 20px
.aside-content
	padding 5px 10px

// flexible aside
.aside
	height 600px
	width 300px
	overflow hidden
	background #EEE
	display flex
	flex-direction column
.ad-block .ad-container
	display none
.ad-container
	flex 1 0 auto
	height auto
.aside-content
	flex 1 1 600px
	overflow-y scroll
              
            
!

JS

              
                
              
            
!
999px

Console