simple-dark-mode-for-wp-dashboard/assets/scss/plugins/_yoast-seo.scss

body.wp-admin:not(.gutenberg-editor-page) .yst-root .yst-sidebar-navigation__item--active.yst-sidebar-navigation__collapsible-button,
body.wp-admin:not(.gutenberg-editor-page) .yst-root .yst-sidebar-navigation__item--active.yst-sidebar-navigation__link,
body.wp-admin:not(.gutenberg-editor-page) .yst-paper,
body.wp-admin:not(.gutenberg-editor-page) #yoast-seo-general div,
body.wp-admin:not(.gutenberg-editor-page) .yst-root .yst-paper {
  background-color: var(--color-dark-grey) !important;
  color: var(--color-paragraph) !important;
  border-color: var(--color-border-light) !important;
  box-shadow: none !important;
}

body #wpwrap .yst-label,
body #wpwrap span.yst-label,
body #wpwrap .yst-grow *,
body #wpwrap .yst-grow span,
body #wpwrap .yst-grow label,
body #wpwrap .yst-grow input,
body #wpwrap .yst-grow textarea,
body #wpwrap .yst-grow li,
body #wpwrap .yst-root .yst-paper * {
  color: var(--color-paragraph) !important;
}

/* Buttons */
.yst-root .yst-badge--plain
body .yst-root .yst-badge--plain,
body #wpwrap .yst-badge,
body #wpwrap .yst-badge--plain,
body #wpwrap .yst-button {
  background-color: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
  color: var(--color-light-grey) !important;
}


body.wp-admin:not(.gutenberg-editor-page) {

  #yoast-seo-dashboard-widget .wordpress-feed .wordpress-feed__footer,
  #yoast-seo-dashboard-widget .wordpress-feed {
    // stylelint-disable-next-line
    border-color: var(--color-border-light) !important;
  }

  .progress__part {
    background-color: var(--color-background-default);
  }

  .wpseo-metabox-content {
    .wpseo-metabox-menu {
      background-color: var(--color-background-default);

      ul li {
        background-color: var(--color-dark-grey);
        color: var(--color-light-grey);

        &:hover,
        &.active,
        &:focus {
          a {
            background-color: var(--color-background-default);
            color: var(--color-light-grey);
          }
        }
      }
    }

    .Alert__AlertContainer-sc-6o5k96-0 {
      background-color: var(--color-dark-grey);
      border-color: var(--color-dark-grey);
      color: var(--color-light-grey);
    }

    .wpseo-meta-section-react.active,
    .wpseo-meta-section.active {
      background-color: var(--color-background-default);
      color: var(--color-light-grey);
    }

    .Collapsible__StyledContainer-sc-13a0b13-1 {
      background-color: var(--color-background-default);
    }

    .Collapsible__StyledHeadingLevel-sc-13a0b13-4 {
      background-color: var(--color-dark-grey);

      button {
        background-color: var(--color-dark-grey);

        svg {
          color: var(--color-light-grey);
        }
      }
    }

    legend,
    .yoast-field-group__title {
      color: var(--color-light-grey);
    }

    .Label__SimulatedLabel-tvz6tj-0 {
      color: var(--color-light-grey);
    }

    #yoast-snippet-preview-container {
      background-color: var(--color-dark-grey);

      .SnippetPreview__MobileDescription-waz8ku-12 {
        color: var(--color-light-grey);
      }
    }

    .draftJsMentionPlugin__mention__29BEd {
      background-color: var(--color-primary);
    }

    .Button__BaseButton-grb41s-4,
    #yoast-get-related-keyphrases-metabox {
      background-color: var(--color-primary);
      border-color: var(--color-primary);
      color: var(--color-light-grey);
    }

    .InputContainer__VariableEditorInputContainer-fmvk3g-0,
    div[role="listbox"] {
      background-color: var(--color-dark-grey);
      border-color: var(--color-dark-grey);
      box-shadow: 0 5px 5px 5px var(--color-background-default);
      color: var(--color-light-grey);
    }

    div[aria-selected="true"] {
      background-color: var(--color-background-default);
    }

    progress {
      background-color: var(--color-black);
      border-color: var(--color-black);
    }

    #snippet-editor-field-slug {
      background-color: var(--color-dark-grey);
    }

    .ContentAnalysis__ContentAnalysisContainer-sc-14uwo9d-0 {
      background-color: var(--color-background-default);
    }
  }

  .yoast-select__control {
    border-color: var(--color-background-default);
  }

  .yoast-select-container,
  .yoast-select__menu {
    background-color: var(--color-dark-grey);

    .yoast-select__option {
      &:hover,
      &:focus,
      &.yoast-select__option--is-focused {
        background-color: var(--color-background-default);
        color: var(--color-light-grey);
      }
    }

    .yoast-select__control--menu-is-open,
    .yoast-select__control--is-focused {
      box-shadow: none;
    }
  }

  .yoast-field-group__select select:focus,
  .yoast-field-group select:focus {
    box-shadow: none;
  }

  .yoast-list--usp li {
    color: var(--color-light-grey);
  }

  .yoast-promo-extension {
    background-color: var(--color-background-default);
    border-color: var(--color-background-default);
    color: var(--color-light-grey);
  }

  .yoast-notifications {
    .yoast-container {
      background-color: var(--color-background-default);
      border-color: var(--color-background-default);

      h3.yoast-notifications-header {
        background-color: var(--color-dark-grey);
        border-bottom: 1px solid var(--color-background-default);
      }

      .yoast-notification {
        background-color: var(--color-dark-grey);
        border-left: 4px solid var(--color-dark-grey);
      }
    }
  }

  .yoast_premium_upsell {
    background-color: var(--color-background-default);
    border-color: var(--color-background-default);
  }

  .yoast-button-upsell,
  .UpsellLinkButton-sc-1velt6w-0 {
    color: var(--color-dark-grey);
  }

  .yoast-sidebar__section {
    background-color: var(--color-background-default);
    border-color: var(--color-background-default);
  }

  .switch-light.switch-yoast-seo > span,
  .switch-toggle.switch-yoast-seo {
    background-color: var(--color-dark-grey);
    border: 1px solid var(--color-dark-grey);
  }

  .switch-light.switch-yoast-seo input:checked ~ span span:first-child,
  .switch-light.switch-yoast-seo span span,
  .switch-toggle.switch-yoast-seo label {
    color: var(--color-light-grey);
  }

  .switch-light.switch-yoast-seo a,
  .switch-toggle.switch-yoast-seo a {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
  }

  .switch-candy a {
    box-shadow: none;
  }

  .wpseo_content_wrapper .paper.tab-block.search-appearance {
    background-color: var(--color-background-default);
  }

  .wpseo_content_wrapper {
    #separator input.radio:checked + label {
      background-color: var(--color-dark-grey);
      border-color: var(--color-primary);
    }

    .kuRQio {
      color: var(--color-light-grey);
    }

    .InputContainer__VariableEditorInputContainer-fmvk3g-0,
    div[role="listbox"] {
      background-color: var(--color-dark-grey);
      border-color: var(--color-dark-grey);
      box-shadow: 0 5px 5px 5px var(--color-background-default);
      color: var(--color-light-grey);
    }

    div[aria-selected="true"] {
      background-color: var(--color-background-default);
    }

    .draftJsMentionPlugin__mention__29BEd {
      background-color: var(--color-primary);
    }

    .Button__BaseButton-grb41s-4 {
      background-color: var(--color-primary);
      border-color: var(--color-primary);
      color: var(--color-light-grey);
    }

    .yoast-styled-select::after {
      border-color: var(--color-light-grey) transparent transparent;
    }

    .Alert__AlertContainer-sc-6o5k96-0 {
      background-color: var(--color-dark-grey);
      border-color: var(--color-dark-grey);
      color: var(--color-light-grey);
    }

    .collapsible-header,
    .collapsible-header button {
      background-color: var(--color-dark-grey);
      border-color: var(--color-dark-grey);
      color: var(--color-light-grey);
    }

    .yoast-field-group__title {
      color: var(--color-light-grey);
    }

    .wpseo-admin-submit.wpseo-admin-submit-fixed {
      background-color: var(--color-dark-grey);
    }
  }
}