fix: spa hijacks back button (closes #400)

Jacky Zhao

2023-08-23 b991cf2ee8a456a15f2b566843d93a9b7a9a0c29

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