Output of atom-one-dark-to-emacs.less from https://gist.github.com/jhacksworth/889f7cf8b09efd81ef0b1b69b3ef8c0a

atom-one-dark-to-emacs.css

/**************************************************************************************************************
  MAPPING

  - First CSS class name is the name of the Emacs atom-one-dark theme color
    variable

  - Second CSS class name is either:
    - the name of the Atom One Dark source variable OR
    - a comment about how the value is obtained

  .<emacs>,
  .<atom>  {
    color: value
  }
**************************************************************************************************************/
.atom-one-dark-accent,
.syntax-accent {
  color: #528bff;
}
.atom-one-dark-fg,
.syntax-fg {
  color: #abb2bf;
}
.atom-one-dark-bg,
.syntax-bg {
  color: #282c34;
}
/* Unknown origin */
.atom-one-dark-bg-1,
.unknown {
  color: #121417;
}
/* @syntax-cursor-line is defined with .04, i.e. 4%, opacity: hsla(@syntax-hue, 100%,  80%, .04) */
/* Simulate opacity blending using the `mix` function from LESS */
/* Current value of atom-one-dark-bg-hl doesn't match: #2F343D */
.atom-one-dark-bg-hl,
.simulate-opacity-blend {
  color: #2c323c;
}
/* atom-one-dark-gutter takes opacity into account for line-number */
/* For .line-number, @syntax-gutter-text-color will be blended with the background color */
/* We can simulate opacity blending using the `mix` function from LESS */
/* .line-number is defined with 0.6, i.e. 60%, opacity */
.atom-one-dark-gutter,
.simulate-opacity-blend {
  color: #4b5363;
}
.atom-one-dark-mono-1,
.mono-1 {
  color: #abb2bf;
}
.atom-one-dark-mono-2,
.mono-2 {
  color: #828997;
}
.atom-one-dark-mono-3,
.mono-3 {
  color: #5c6370;
}
.atom-one-dark-cyan,
.hue-1 {
  color: #56b6c2;
}
.atom-one-dark-blue,
.hue-2 {
  color: #61afef;
}
.atom-one-dark-purple,
.hue-3 {
  color: #c678dd;
}
.atom-one-dark-green,
.hue-4 {
  color: #98c379;
}
.atom-one-dark-red-1,
.hue-5 {
  color: #e06c75;
}
.atom-one-dark-red-2,
.hue-5-2 {
  color: #be5046;
}
.atom-one-dark-orange-1,
.hue-6 {
  color: #d19a66;
}
.atom-one-dark-orange-2,
.hue-6-2 {
  color: #e5c07b;
}
.atom-one-dark-gray,
.syntax-selection-color {
  color: #3e4451;
}
.atom-one-dark-silver,
.ui-fg {
  color: #9da5b4;
}
.atom-one-dark-black,
.ui-level-3-color {
  color: #21252b;
}
.atom-one-dark-border,
.ui-border {
  color: #181a1f;
}