Positioning of nav element

my code for positioning my nav element on the left half of the page isnt working
link to the project=> https://codepen.io/grey_being/pen/wvaqpbe?editors=0100

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I’m not sure what output you’re looking for.

The first issue I can see is that one of your HTML tags has no name.

<!-- line 3 -->
< id="selection">

I gather that it should be <nav id="selection">?