diff --git a/README.org b/README.org
index 36f7162..332ad8f 100644
--- a/README.org
+++ b/README.org
@@ -8,3 +8,5 @@ Get the file, add to load path, and
 Show the documentation of the symbol at point: =eglot-doc-help-at-point=
 
 Show documentation upon hover: =eglot-doc-hover-mode=. Note that you need to enable ElDoc mode for this to work.
+
+Adjust =:background= of =eglot-doc-border= face for border color. Adjust =:background= of =eglot-doc-body= face for background color of childframe.
diff --git a/eglot-doc.el b/eglot-doc.el
index 5ad42f8..01b97e0 100644
--- a/eglot-doc.el
+++ b/eglot-doc.el
@@ -36,6 +36,9 @@
                             (((background light)) . (:background "dark")))
   "The border color used in childframe.")
 
+(defface eglot-doc-body '((t . (:background nil)))
+  "Body face used in eglot doc childframe. Only :background is used.")
+
 (defvar eglot-doc-frame-parameters
   '(
     ;; (left . -1)
@@ -143,6 +146,7 @@ Checkout `lsp-ui-doc--make-frame', `lsp-ui-doc--move-frame'."
     (set-window-dedicated-p window t)
     (redirect-frame-focus frame (frame-parent frame))
     (set-face-attribute 'internal-border frame :inherit 'eglot-doc-border)
+    (set-face-attribute 'default frame :background (face-attribute 'eglot-doc-body :background main-frame))
     ;; set size
     (let* ((size
             (window-text-pixel-size