docs: Update showcase.md (#1031)

Xinyang Yu

2024-03-24 85a737b4ee72fb4dba12e1aacbd87d1636cfc30e

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1000px;
$sidePanelWidth: 380px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;
$boldWeight: 700;
$semiBoldWeight: 600;
$normalWeight: 400;