Update showcase.md (#539)

freenandes

2023-10-17 ed971800c0a683f7096922fee0a6901250e239ae

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$pageWidth: 750px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 380px;
$topSpacing: 6rem;
$fullPageWidth: $pageWidth + 2 * $sidePanelWidth;