update export

Author: abnerlee

_posts/basic/2021-04-20-Export.md

@@ -190,19 +190,10 @@ You can select `Export` →  `PDF` from the preferences panel to config export o
 
 #### Paper Size
 
-Set **paper size** (A4, A5, etc) or **custom size**, and **page margins**.
+Set **paper size** (A4, A5, etc) or **custom size**, and **page margins** like below:
 
-Note: on Windows/Linux
+<img src="/media/export/Screenshot 2024-12-08 at 10.54.07.png" alt="Screenshot 2024-12-08 at 10.54.07" style="zoom:50%;" />
 
-```css
-@media print {
-  @page {
-  	margin: 27mm 16mm 27mm 16mm; 
-	}
-}
-```
-
-Will be respected when “*Margin*” is set to default (But please unset margin for `#write` or `body` which may also affect the final output), on macOS, they are ignored.
 #### Theme
 
 You could choose another theme applied for exported PDF in preferences panel → Export → PDF. By default, current theme will be used.