Remove hard-coded colors which break dark mode (#557)

SHA: f16b36a
Reason: push, by anssiko

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: reillyeon

index.html

@@ -7,7 +7,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED" rel="stylesheet">
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://www.w3.org/TR/webnn/" rel="canonical">
-  <meta content="c9d2dd79341c8d2ad68cf2f048db650037c4adbe" name="document-revision">
+  <meta content="f16b36a17e8e587e33cf5492e51807f0ccad74ef" name="document-revision">
 <style>
 /* Make <dl> blocks more distinct from their surroundings. */
 main dl:not(.switch) {
@@ -67,7 +67,6 @@
 
 div.algorithm-steps {
     padding: .5em;
-    background-color: ghostwhite;
 }
 
 .algorithm-steps {
@@ -93,7 +92,6 @@
     padding: .5em;
     border: thin solid #88e !important;
     border-radius: .5em;
-    background-color: ghostwhite;
 }
 
 .informalsteps {
@@ -118,7 +116,6 @@
     padding: .5em;
     border: thin solid #88e !important;
     border-radius: .5em;
-    background-color: aliceblue;
 }
 
 .internal-slots {