fix 2023-8 img incl. filter

Author: abrudz

docs/2023/8.md

@@ -7,7 +7,12 @@ url: "https://apl.quest/2023/8"
 
 # <span class=s>2023-</span>8: Critical Thinking
 <!-- Write a function that takes a 3-element integer left argument representing a valid birthdate and 3-element integer right argument representing a valid date occurring on or after the left argument and returns a 3-element integer array representing the date of the next double or triple critical day occurring on or after the date represented by the right argument. -->
-<img style="max-width:45%;height:400px;float:right;filter: invert(.75)contrast(1.25)saturate(2);" src="../img/bio.png" />
+
+<style>
+#bio{max-width:45%;height:400px;float:right}
+[data-md-color-scheme="slate"] #bio{filter:invert(.75)contrast(1.25)saturate(2)}
+</style>
+<img id="bio" src="../../img/bio.png" />
 
 The biorhythm theory is a pseudo-scientific idea that one's life is affected by three rhythmic cycles beginning from one's date of birth. The cycles are: