doc: emphasize security warning in vm module doc

Refs: #40718

PR-URL: #41916
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/vm.md

@@ -9,8 +9,10 @@
 <!-- source_link=lib/vm.js -->
 
 The `vm` module enables compiling and running code within V8 Virtual
-Machine contexts. **The `vm` module is not a security mechanism. Do
-not use it to run untrusted code.**
+Machine contexts.
+
+<strong class="critical">The `vm` module is not a security
+mechanism. Do not use it to run untrusted code.</strong>
 
 JavaScript code can be compiled and run immediately or
 compiled, saved, and run later.

doc/api_assets/style.css

@@ -11,6 +11,7 @@
   --red1: #d60027;
   --red2: #d50027;
   --red3: #ca5010;
+  --red4: #ff7070;
   --green1: #3e7a38;
   --green2: #5a8147;
   --green3: #64de64;
@@ -29,6 +30,7 @@
   --background-color-highlight: var(--white-smoke);
   --color-brand-primary: var(--gray6);
   --color-brand-secondary: var(--green1);
+  --color-critical: var(--red1);
   --color-fill-app: var(--white);
   --color-fill-side-nav: var(--gray6);
   --color-links: var(--green1);
@@ -40,6 +42,7 @@
 
 .dark-mode {
   --background-color-highlight: var(--black2);
+  --color-critical: var(--red4);
   --color-fill-app: var(--black1);
   --color-fill-side-nav: var(--black3);
   --color-links: var(--green5);
@@ -165,6 +168,10 @@ em code {
   line-height: 1.5rem;
 }
 
+.critical, .critical code {
+  color: var(--color-critical);
+}
+
 li.version-picker {
   position: relative;
 }