fix: ensure code exists inside pre before adding clipboard

Jacky Zhao

2023-08-20 7b7064ad2be68e8d6d43123c12529ca94a325fcb

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 400px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;