Swap colors of AsciiDoc `IMPORTANT` and `WARNING` blocks
diff --git a/antora-playbook.yaml b/antora-playbook.yaml
index 08518b2..2543327 100644
--- a/antora-playbook.yaml
+++ b/antora-playbook.yaml
@@ -72,6 +72,9 @@
         <!-- `@asciidoctor/tabs` extension styles -->
         <link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/tabs.css">
         <style>
+          /* Swap colors of `IMPORTANT` and `WARNING` blocks */
+          .doc .admonitionblock.important .icon { background-color: #f70; }
+          .doc .admonitionblock.warning .icon { background-color: #e40046; }
           /* Default `h4`, `h5`, and `h6` are smaller than the normal text, fix header font sizing: */
           .doc h1 { font-size: 1.9rem; }
           .doc h2 { font-size: 1.7rem; }