diff --git a/_extensions/quarto-openapi/lib/markdown.ts b/_extensions/quarto-openapi/lib/markdown.ts
index c88fa50..8b34df5 100644
--- a/_extensions/quarto-openapi/lib/markdown.ts
+++ b/_extensions/quarto-openapi/lib/markdown.ts
@@ -55,6 +55,7 @@ export function gridTable(headers: string[], rows: TableRow[]): string[] {
     }
   };
 
+  lines.push("::: {.quarto-openapi-table}");
   lines.push(separator("-"));
   emitRow(headerLines);
   lines.push(separator("="));
@@ -64,6 +65,8 @@ export function gridTable(headers: string[], rows: TableRow[]): string[] {
     lines.push(separator("-"));
   }
 
+  lines.push(":::");
+
   return lines;
 }
 
diff --git a/_extensions/quarto-openapi/quarto-openapi-styles.css b/_extensions/quarto-openapi/quarto-openapi-styles.css
index 270515d..a77bc0c 100644
--- a/_extensions/quarto-openapi/quarto-openapi-styles.css
+++ b/_extensions/quarto-openapi/quarto-openapi-styles.css
@@ -1,3 +1,15 @@
+/* Prevent schema tables from overflowing into the sidebar */
+.quarto-openapi-table table {
+  table-layout: fixed;
+  width: 100%;
+}
+
+.quarto-openapi-table td,
+.quarto-openapi-table th {
+  overflow-wrap: break-word;
+  word-break: break-word;
+}
+
 /* Nesting indentation for schema property tables */
 .schema-nest-1 { padding-left: 1em; }
 .schema-nest-2 { padding-left: 2em; }