diff --git a/.changeset/mighty-jobs-unite.md b/.changeset/mighty-jobs-unite.md
new file mode 100644
index 0000000000..c8e880ba3e
--- /dev/null
+++ b/.changeset/mighty-jobs-unite.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-api-docs': patch
+---
+
+Uses theme values to style the API definition schema so that theme overrides apply.
diff --git a/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx b/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
index 1505646dee..ea1df525b7 100644
--- a/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
+++ b/plugins/api-docs/src/components/OpenApiDefinitionWidget/OpenApiDefinition.tsx
@@ -94,7 +94,8 @@ const useStyles = makeStyles(theme => ({
           .errors small`]: {
         color: theme.palette.text.secondary,
       },
-      [`& .parameter__name.required:after`]: {
+      [`& .parameter__name.required:after,
+        .parameter__name.required span`]: {
         color: theme.palette.warning.dark,
       },
       [`& table.model,
@@ -132,6 +133,46 @@ const useStyles = makeStyles(theme => ({
       [`& span.prop-type`]: {
         color: theme.palette.success.light,
       },
+      [`& .opblock-control-arrow svg, .authorization__btn .unlocked`]: {
+        fill: theme.palette.text.primary,
+      },
+      [`& .json-schema-2020-12__title,
+          .json-schema-2020-12-keyword__name,
+          .json-schema-2020-12-property .json-schema-2020-12__title,
+          .json-schema-2020-12-keyword--description`]: {
+        color: theme.palette.text.primary,
+      },
+      [`.json-schema-2020-12-accordion__icon svg`]: {
+        fill: theme.palette.text.primary,
+      },
+      [`& .json-schema-2020-12-accordion,
+          .json-schema-2020-12-expand-deep-button`]: {
+        background: 'none',
+        appearance: 'none',
+      },
+      [`& .json-schema-2020-12-expand-deep-button,
+          .json-schema-2020-12-keyword__name--secondary,
+          .json-schema-2020-12-keyword__value--secondary,
+          .json-schema-2020-12__attribute--muted,
+          .json-schema-2020-12-keyword__value--const,
+          .json-schema-2020-12-keyword__value--warning`]: {
+        color: theme.palette.text.secondary,
+      },
+      [`& .json-schema-2020-12-body,
+          .json-schema-2020-12-keyword__value--const,
+          .json-schema-2020-12-keyword__value--warning`]: {
+        borderColor: theme.palette.text.secondary,
+      },
+      [`.json-schema-2020-12__constraint--string`]: {
+        backgroundColor: theme.palette.primary.main,
+      },
+      [`& .json-schema-2020-12__attribute--primary`]: {
+        color: theme.palette.primary.main,
+      },
+      [`& .json-schema-2020-12-property--required>.json-schema-2020-12:first-of-type>.json-schema-2020-12-head .json-schema-2020-12__title:after`]:
+        {
+          color: theme.palette.warning.dark,
+        },
     },
   },
 }));