fix indexing causing main thread freeze, various polish

Jacky Zhao

2023-07-04 ab9da02c60c962128820e6874e6f07c98bc3dda7

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$pageWidth: 800px;
$mobileBreakpoint: 600px;
$tabletBreakpoint: 1200px;
$sidePanelWidth: 400px;
$topSpacing: 6rem;