hugo-theme-relearn/css/theme-relearn-bright.css

:root {
  --PRIMARY-color: rgba(131, 201, 50, 1); /* brand primary color */
  --SECONDARY-color: rgba(99, 128, 208, 1); /* brand secondary color */
  --ACCENT-color: rgb(255, 102, 78, 1); /* brand accent color, used for search highlights */

  --MAIN-TEXT-color: rgba(0, 0, 0, 1); /* text color of content and h1 titles */
  --MAIN-LINK-HOVER-color: rgba(32, 40, 145, 1); /* hovered link color of content */
  --MAIN-BG-color: rgba(255, 255, 255, 1); /* background color of content */
  --MAIN-TITLES-TEXT-color: rgba(16, 16, 16, 1); /* text color of h2-h6 titles and transparent box titles */

  --CODE-theme: relearn-light; /* name of the chroma stylesheet file */
  --CODE-BLOCK-color: rgba(39, 40, 34, 1); /* fallback text color of block code; should be adjusted to your selected chroma style */
  --CODE-BLOCK-BG-color: rgba(250, 250, 250, 1); /* fallback background color of block code; should be adjusted to your selected chroma style */
  --CODE-BLOCK-BORDER-color: rgba(216, 216, 216, 1); /* border color of block code */
  --CODE-INLINE-color: rgba(94, 94, 94, 1); /* text color of inline code */
  --CODE-INLINE-BG-color: rgba(255, 250, 233, 1); /* background color of inline code */
  --CODE-INLINE-BORDER-color: rgba(248, 232, 200, 1); /* border color of inline code */

  --BROWSER-theme: light; /* name of the theme for browser scrollbars of the main section */
  --MERMAID-theme: default; /* name of the default Mermaid theme for this variant, can be overridden in hugo.toml */
  --OPENAPI-theme: light; /* name of the default OpenAPI theme for this variant, can be overridden in hugo.toml */
  --OPENAPI-CODE-theme: idea; /* name of the default OpenAPI code theme for this variant, can be overridden in hugo.toml */

  --MENU-HEADER-BG-color: rgba(0, 0, 0, 0); /* background color of menu header */
  --MENU-HEADER-SEPARATOR-color: rgba(96, 96, 96, 1); /* separator color between menu header and menu */

  --MENU-HOME-LINK-color: rgba(64, 64, 64, 1); /* home button color if configured */
  --MENU-HOME-LINK-HOVER-color: rgba(0, 0, 0, 1); /* hovered home button color if configured */

  --MENU-SEARCH-color: rgba(64, 64, 64, 1); /* text and icon color of search box */
  --MENU-SEARCH-BG-color: rgba(255, 255, 255, 0.2); /* background color of search box */
  --MENU-SEARCH-BORDER-color: transparent; /* border color of search box */

  --MENU-SECTIONS-BG-color: rgba(131, 201, 50, 1); /* background of the menu; this is NOT just a color value but can be a complete CSS background definition including gradients, etc. */
  --MENU-SECTIONS-ACTIVE-BG-color: transparent; /* background color of the active menu section */
  --MENU-SECTIONS-LINK-color: rgba(50, 50, 50, 1); /* link color of menu topics */
  --MENU-SECTIONS-LINK-HOVER-color: rgba(255, 255, 255, 1); /* hovered link color of menu topics */
  --MENU-SECTION-ACTIVE-CATEGORY-color: rgba(50, 50, 50, 1); /* text color of the displayed menu topic */
  --MENU-SECTION-SEPARATOR-color: rgba(96, 96, 96, 1); /* separator color between menu sections and menu footer */

  --BOX-CAPTION-color: rgba(255, 255, 255, 1); /* text color of colored box titles */
  --BOX-BG-color: rgba(255, 255, 255, 0.833); /* background color of colored boxes */
  --BOX-TEXT-color: rgba(16, 16, 16, 1); /* text color of colored box content */
}

body a#R-logo,
body a#R-logo:hover,
body #R-logo svg,
body #R-logo svg * {
  color: var(--MENU-SEARCH-color);
  fill: var(--MENU-SEARCH-color) !important;
}