diff --git a/src/client/app/common/views/components/code-core.vue b/src/client/app/common/views/components/code-core.vue
index a50d943948..75564f07d4 100644
--- a/src/client/app/common/views/components/code-core.vue
+++ b/src/client/app/common/views/components/code-core.vue
@@ -5,7 +5,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import 'prismjs';
-import 'prismjs/themes/prism.css';
+import 'prismjs/themes/prism-okaidia.css';
 import Prism from 'vue-prism-component';
 
 export default Vue.extend({
diff --git a/src/client/app/common/views/components/misskey-flavored-markdown.vue b/src/client/app/common/views/components/misskey-flavored-markdown.vue
index 5cb102240e..71d3a67662 100644
--- a/src/client/app/common/views/components/misskey-flavored-markdown.vue
+++ b/src/client/app/common/views/components/misskey-flavored-markdown.vue
@@ -30,4 +30,7 @@ export default Vue.extend({
 		color var(--mfmQuote)
 		border-left solid 3px var(--mfmQuoteLine)
 
+	>>> pre code
+		font-size 80%
+
 </style>