actix-website/src/css/custom.css

:root {
  --background-color-secondary: #f8f8f8;
  --examples-odd-background-color: var(--background-color-secondary);
  --logo-filter: unset;

  /* docusaurus vars
  https://docusaurus.io/docs/styling-layout#styling-your-site-with-infima
  */
  --ifm-color-primary: #7036ab;
  --ifm-color-primary-dark: #65319a;
  --ifm-color-primary-darker: #5f2e91;
  --ifm-color-primary-darkest: #4e2678;
  --ifm-color-primary-light: #7b3bbc;
  --ifm-color-primary-lighter: #8140c3;
  --ifm-color-primary-lightest: #925acb;
  --ifm-font-size-base: 16px;
  --ifm-code-font-size: 90%;
  --ifm-background-color: #fff;
  --ifm-footer-background-color: var(--ifm-background-surface-color);
  --ifm-menu-color-background-active: var(--ifm-color-emphasis-200);
}

html[data-theme="dark"] {
  --background-color-secondary: #0a191c;
  --examples-odd-background-color: var(--ifm-hero-background-color);
  --logo-filter: brightness(0) invert(1);

  /* docusaurus vars */
  --ifm-background-color: #0a141c;
  --ifm-color-primary: #e98ef5;
  --ifm-color-primary-dark: #e26af2;
  --ifm-color-primary-darker: #df59f0;
  --ifm-color-primary-darkest: #d423ec;
  --ifm-color-primary-light: #f0b2f8;
  --ifm-color-primary-lighter: #f3c3fa;
  --ifm-color-primary-lightest: #fef9fe;
  --ifm-footer-background-color: #0a141c;
  --ifm-navbar-background-color: var(--ifm-background-color);
  --ifm-hero-background-color: var(--background-color-secondary);
  --ifm-menu-color-background-active: #21243d;
}

.docusaurus-highlight-code-line {
  background-color: rgb(72, 77, 91);
  display: block;
  margin: 0 calc(-1 * var(--ifm-pre-padding));
  padding: 0 var(--ifm-pre-padding);
}

.navbar__logo {
  filter: var(--logo-filter);
}