Issue #3378151: "Styleguide" page is not styled as bootstrap cheatsheet

resources/cheatsheet/index_files/cheatsheet.css

@@ -2,6 +2,18 @@ body {
   scroll-behavior: smooth;
 }
 
+@media (min-width: 1200px) {
+  .block-system-main-block {
+    display: grid;
+    grid-template-rows: auto;
+    grid-template-columns: 1fr 4fr 1fr;
+    gap: 1rem;
+    margin-top: -4rem;
+    position: relative;
+    z-index: -1;
+  }
+}
+
 /**
  * Bootstrap "Journal code" icon
  * @link https://icons.getbootstrap.com/icons/journal-code/