diff --git a/src/index.css b/src/index.css
index e2fd652..ba1cfc2 100644
--- a/src/index.css
+++ b/src/index.css
@@ -600,6 +600,10 @@ body:not([data-theme="light"]) .folder-item {
   border-color: transparent;
 }
 
+body:not([data-theme="light"]) .editor__textarea-wrap--preview {
+  background: var(--bg);
+}
+
 .editor__textarea-wrap--split {
   flex-direction: row;
 }
@@ -613,6 +617,10 @@ body:not([data-theme="light"]) .folder-item {
   flex: 1;
 }
 
+body:not([data-theme="light"]) .editor__textarea-wrap--split .markdown-preview {
+  background: var(--bg);
+}
+
 .editor__textarea-wrap:focus-within {
   border-color: rgba(255, 255, 255, 0.18);
 }