diff --git a/settings/gui-settings.el b/settings/gui-settings.el
index 6f2a80ae..89108880 100644
--- a/settings/gui-settings.el
+++ b/settings/gui-settings.el
@@ -16,32 +16,41 @@
 
 ;;; Code:
 
+;; defining characters, e.g. vertical bar │:
+;; - 9474     as decimal
+;; - #o22402  as octal
+;; - #x2502   as unicode
+;; using characters inside string:
+;; - "\u2502"
+
 (use-package emacs
   :delight
-  (auto-fill-function "Fa")  ;; "\u21B5"
-  (compilation-shell-minor-mode "Csh")  ;; "\u24B8\uFF53"
-  (eldoc-mode "Ed")  ;; \u24BA e
-  (visual-line-mode "Vl")  ;; " Wrap" "\u21A9"
-  (whitespace-mode "Ws")   ;; "\u2423 \u005F ws"
+  (auto-fill-function "Fa")              ;; "\u21B5"
+  (compilation-shell-minor-mode "Csh")   ;; "\u24B8\uFF53"
+  (eldoc-mode "Ed")                      ;; "\u24BA" e
+  (visual-line-mode "Vl")                ;; " Wrap" "\u21A9"
+  (whitespace-mode "Ws")                 ;; "\u2423 \u005F ws"
   ;; major modes
-  (calendar-mode "Ca")  ;; "Calendar" "\u01F4C6" "\u01F152\uFF41\uFF4C"
-  (css-mode "Css")  ;; "CSS"" "\u01F152ss
-  (emacs-lisp-mode "El")  ;; "EL" "\u01F15B\uFF45"
-  (eshell-mode "Esh")  ;; "Esh" "\u01F162\uFF45
-  (fundamental-mode "Fu")  ;; "F " "\u01F155" ;; not working
-  (help-mode "H")  ;; "H " "\u01F157"
-  (Info-mode "I")  ;; "I " "\u01F158" ;; not working
-  (latex-mode "La")  ;; "LaTeX " "\u01F15B\uFF41"
-  (lisp-interaction-mode "Lii")  ;; "LI \u01F15B\u24A4" "\u01F15B\uFF49
-  (messages-mode "M")  ;; "M " "\u01F15C"  ;; not working
-  (messages-buffer-mode "M")  ;; "M " "\u01F15C"  ;; not working
-  (inferior-python-mode "Pyi")  ;; "IPy \u01F15F\u24A4" "\u01F15F\uFF49"
+  (calendar-mode "Ca")                   ;; "Calendar" "\u01F4C6" "\u01F152\uFF41\uFF4C"
+  (css-mode "Css")                       ;; "CSS"" "\u01F152ss
+  (emacs-lisp-mode "El")                 ;; "EL" "\u01F15B\uFF45"
+  (eshell-mode "Esh")                    ;; "Esh" "\u01F162\uFF45
+  (fundamental-mode "Fu")                ;; "F " "\u01F155" ;; not working
+  (help-mode "H")                        ;; "H " "\u01F157"
+  (Info-mode "I")                        ;; "I " "\u01F158" ;; not working
+  (latex-mode "La")                      ;; "LaTeX " "\u01F15B\uFF41"
+  (lisp-interaction-mode "Lii")          ;; "LI \u01F15B\u24A4" "\u01F15B\uFF49
+  (messages-mode "M")                    ;; "M " "\u01F15C"  ;; not working
+  (messages-buffer-mode "M")             ;; "M " "\u01F15C"  ;; not working
+  (inferior-python-mode "Pyi")           ;; "IPy \u01F15F\u24A4" "\u01F15F\uFF49"
   :hook
   (prog-mode . display-fill-column-indicator-mode)
   (help-mode . visual-line-mode)
   (messages-buffer-mode . visual-line-mode)
   :config
-  (set-face-attribute 'fill-column-indicator nil :foreground "DarkSlateGray"))  ;; inherit shadow
+  ;; display-fill-column-indicator
+  ;; (setq display-fill-column-indicator-character 9474)  ;; 9474 is default
+  (set-face-attribute 'fill-column-indicator nil :foreground "DarkSlateGray"))
 
 
 ;;          ┌────────────── Frame width ───────────────┐
@@ -80,6 +89,7 @@
   (window-divider-mode 1))
 
 (use-package scroll-bar
+  ;; built-in
   :defer t
   :config
   ;; `scroll-bar-mode' sets for all frames and all windows
diff --git a/settings/theme-settings.el b/settings/theme-settings.el
index 0e49a02e..6fa15294 100644
--- a/settings/theme-settings.el
+++ b/settings/theme-settings.el
@@ -36,19 +36,25 @@
 ;; ✈↵＃↹⏎⇤⇥␣↑↓←→ ☐☑
 ;; :rage::hamburger:
 ;; see M-x describe-char
+
+;; (set-frame-font "DejaVu Sans Mono-10")
+;; (set-frame-font "DejaVu Sans Mono:pixelsize=13")
+;; (set-frame-font (font-spec :name "DejaVu Sans Mono" :size 13))
 (cond
  ((find-font (font-spec :name "DejaVu Sans Mono"))
-  (set-frame-font "DejaVu Sans Mono-10"))
+  (set-frame-font (font-spec :name "DejaVu Sans Mono" :size 13)))
+ ((find-font (font-spec :name "Noto Sans Mono"))                      ;; parentheses moving
+  (set-frame-font (font-spec :name "Noto Sans Mono" :size 13)))
  ((find-font (font-spec :name "Source Han Mono"))
   (set-frame-font "Source Han Mono-9"))
  ((find-font (font-spec :name "inconsolata"))
-  (set-frame-font "inconsolata-10"))
+  (set-frame-font (font-spec :name "inconsolata" :size 16)))
  ((find-font (font-spec :name "Source Code Pro"))
   (set-frame-font "Source Code Pro-10"))
  ((find-font (font-spec :name "Lucida Console"))
   (set-frame-font "Lucida Console-10"))
- ((find-font (font-spec :name "courier"))
-  (set-frame-font "courier-10")))
+ ((find-font (font-spec :name "courier"))                             ;; is breathing if underline is displayed dynamically
+  (set-frame-font (font-spec :name "courier" :size 14))))
 
 (use-package emojify
   :if window-system