hugo-theme-minima/assets/css/theme.scss

:root {
  // code highlighting
  --code-back: #f6f8fa;
  --code-text: #24292f;
  --code-line-number: #999;
  --code-keyword: #cf222e;
  --code-attribute: #0550ae;
  --code-literal-string: #0a3069;
  --code-literal-number: #b5cea8;
  --code-comment: #6e7781;
  --code-builtin-type: #cf222e;
  --code-function: #0550ae;
  --code-meta: #cf222e;
  --code-highlighted-line: #e9e9e9;
}

.light {
  --prime: #3170a7;
  --grid: #e1e1e1;
  --back: #fff;
  --text: #333;
}

.dark {
  --prime: #3170a7;
  --back: #181818;
  --text: silver;
  --grid: #555;

  // code highlighting
  --code-back: #1d1d1d;
  --code-text: #d4d4d4cc;
  --code-line-number: #999999ca;
  --code-keyword: #569cd6cb;
  --code-attribute: #9cdcfecb;
  --code-literal-string: #ce9178;
  --code-literal-number: #b5cea8;
  --code-comment: #517043d5;
  --code-builtin-type: #4ec9b0cb;
  --code-function: #dcdcaaca;
  --code-meta: #c586c0cb;
  --code-highlighted-line: #9494951b;
}

.sand {
  --prime: #3170a7;
  --back: #e6dece;
  --text: #434343;
  --grid: #555;

  --code-back: #dbd3c1be;
  --code-text: #24292f;
  --code-highlighted-line: #cec3ac;

  --back-image: url('texture.png');
}

.rock {
  --prime: #3170a7;
  --back: #ccc;
  --text: #434343;
  --grid: #555;

  --code-back: #c1c1c1be;
  --code-text: #24292f;
  --code-highlighted-line: #afaeae;

  --back-image: url('texture.png');
}