bootstrap fixed top navbar covers content

&lt;nav class="navbar navbar-expand-sm bg-light fixed-top"&gt;

&lt;nav class="navbar fixed-top navbar-light bg-light"&gt;
  &lt;a class="navbar-brand" href="#"&gt;Fixed top&lt;/a&gt;
&lt;/nav&gt;

&lt;section id="headnev" class="navbar navbar-fixed-top"&gt;

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