diff --git a/README.org b/README.org
index 2c09245..d2cc9da 100644
--- a/README.org
+++ b/README.org
@@ -22,7 +22,7 @@ It is also available on [[https://melpa.org/#/eldoc-box][MELPA]]
 - =eldoc-box-eglot-help-at-point= :: See below.
 ** Face
 -  =eldoc-box-border= :: Adjust =:background= of this face for border color.
-- =eldoc-box-body= :: Adjust =:background= and =:font= of  this face for background color and font of the childframe. I suggest to use a nice Sans Serif font, such as Source Sans Pro.
+- =eldoc-box-body= :: Default face used by childframe.  I suggest to use a nice Sans Serif font such as Source Sans Pro, and a lighter or darker background.
 ** Variable
 - =eldoc-box-max-pixel-width= & =eldoc-box-max-pixel-height= :: Set them according to the screen resolution of your machine.
 - =eldoc-box-only-multi-line= :: Set this to non-nil and eldoc-box only display multi-line message in childframe. One line messages are left in minibuffer.
diff --git a/eldoc-box.el b/eldoc-box.el
index e338286..cb934b0 100644
--- a/eldoc-box.el
+++ b/eldoc-box.el
@@ -51,7 +51,7 @@
   "The border color used in childframe.")
 
 (defface eldoc-box-body '((t . (:background nil)))
-  "Body face used in eglot doc childframe. Only :background and :font are used.")
+  "Body face used in eglot doc childframe.")
 
 (defvar eldoc-box-only-multi-line nil
   "If non-nil, only use childframe when there are more than one line.")
@@ -182,6 +182,7 @@ You can use C-g to hide the doc."
         (setq mode-line-format nil)
         ;; without this, clicking childframe will make doc buffer the current buffer
         ;; and `eldoc-box--maybe-cleanup' in `eldoc-box--cleanup-timer' will clear the childframe
+        (buffer-face-set 'eldoc-box-body)
         (setq eldoc-box-hover-mode t)
         (erase-buffer)
         (insert str)
@@ -299,14 +300,10 @@ Checkout `lsp-ui-doc--make-frame', `lsp-ui-doc--move-frame'."
                     buffer
                     `((child-frame-parameters . ,parameter))))
       (setq frame (window-frame window)))
-    (set-face-attribute 'fringe frame :background nil :inherit 'default)
+    (set-face-attribute 'fringe frame :background nil :inherit 'eldoc-box-body)
     (set-window-dedicated-p window t)
     (redirect-frame-focus frame (frame-parent frame))
     (set-face-attribute 'internal-border frame :inherit 'eldoc-box-border)
-    (set-face-attribute 'default frame
-                        :background (face-attribute 'eldoc-box-body :background main-frame)
-                        :font (face-attribute 'eldoc-box-body :font main-frame))
-
     ;; set size
     (eldoc-box--update-childframe-geometry frame window)
     (setq eldoc-box--frame frame)