nasdaq-dark.user.css

/* ==UserStyle==
@name         Nasdaq Dark
@namespace    Stylus
@version      0.1.1
@homepageURL  https://gist.github.com/Varstahl/c64a8d8d07023c0446eb48786239bd11/raw/nasdaq-dark.user.css
@license      BSD-2-Clause
@author       Varstahl
==/UserStyle== */

@-moz-document regexp("https://www.nasdaq.com/market-activity/stocks/.+") {
    .symbol-page-header__right-rail, .quote-detail__top-grid-ads, .layout--right-rail, .header-ads, .ads__midpage-fullwidth, .ads__midpage-twothirdswidth, .ads__native, .quote-detail-nav__ads { display: none !important; }
    .quote-detail__top-grid { grid-template-areas: "chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart chart"
    "data  data  data  data  data  data  data  data  data  data  data  data  data  data  data  data data data data data data data data data"; }
    .alert__icon > div { max-width: 10rem; filter: invert(100%); }
    .layout--main { width: 100% !important; }
    .symbol-page-header__content { width: 100% !important; padding-right: 1.8%; }
    .quote-page-chart .quote-page-chart__content { width: 84% !important; margin-left: 16% !important; }
    .quote-subdetail-full .quote-page-chart__content { width: 100% !important; margin-left: 0 !important; }
    body, .page__main, .quote-detail-nav__content, .alert__box, .quote-page-chart__previous-close, .quote-page-chart__content, .quote-detail-nav__link-text_lower_bar, .quote-detail-nav__link-text_lower_bar, .real-time-trades__cell, .after-hours-quote__cell, .pre-market-quote__cell, h3 a { background: #111 !important; color: #aaa !important; }
    .quote-subdetail__content { background: inherit; }
    rect.highcharts-background, path.highcharts-label-box { fill: #111 !important; }
    g.highcharts-axis-labels > text, text.highcharts-subtitle, .highcharts-label > text, .disclaimer__container p, .disclaimer__container li, .symbol-ticker__name, #currentSymbol, table th { color: #eee !important; fill: #eee !important; }
    .quote-subdetail__content::before { background: transparent !important; }
    .breadcrumbs { margin-left: 16.1% !important; }
    .pre-market-quote__table tbody tr:hover>*, .after-hours-quote__table tbody tr:hover>*, .real-time-trades__table tbody tr:hover>* { color: #111 !important; background: #0090ba !important; }
    .quote-subdetail__indented-components-container { width: 84% !important; margin-left: 16% !important; }
    .loader-overlay:not(.loader-overlay--transparent)::after { background: transparent; }
    path.highcharts-label-box { stroke: #fff; }
    path.highcharts-shadow { stroke: rgba(0, 255, 255, .75); }
}

For a darker, leaner Nasdaq.