config.css

:root {
  /* Practice direction */
  --both-practice-icon: "⇔";
  --both-practice-color: goldenrod;
  --forward-practice-icon: "⇒";
  --forward-practice-color: green;
  --backward-practice-icon: "⇐";
  --backward-practice-color: blue;
  --disabled-practice-icon: "⇏";
  --disabled-practice-color: tomato;

  /* Special icons for questions.
    
     Normally it would not make much sense to find the question given the answer, like "??? ?:: 42"
     so you can enable showing a warning when this is the case.
     If you use question cards to work around the CD-Framework and store arbitrary associative pairs
     then you can disable this extra style in the Code section.
   */
  --question-backward-practice-icon: "!⇐!";
  --question-backward-practice-color: red;
  --question-both-practice-icon: "!⇔!";
  --question-both-practice-color: red;

  /* Card type icons */
  --concept-icon-color: green;
  --descriptor-icon-color: royalblue;
  --question-icon-color: mediumpurple;
  --slot-icon-color: grey;

  /* If you are using the ASCII Icons (enable in the Code section)
     you can configure the content here. Unicode symbols should also work.
   */
  --concept-icon: "〈C〉";
  --descriptor-icon: "〈D〉";
  --question-icon: "〈?〉";
  --slot-icon: "〈S〉";
  --rem-icon-font-weight: bold;
}