Merge pull request #984 from Satoshi-Sh/feat/#981-add-fullwidth-property

Add fullwidth description to file_selector and file_download

docs/manuals/gui/viselements/file_download.md_template

@@ -19,6 +19,14 @@ The download can be triggered when clicking on a button or can be performed auto
 All the file download controls are generated with the "taipy-file_download" CSS class. You can use this class
 name to select the file download controls on your page and apply style.
 
+### [Stylekit](../styling/stylekit.md) support
+
+The [Stylekit](../styling/stylekit.md) provides a specific class that you can use to style file download elements:
+
+* *fullwidth*<br/>
+    If a file download element uses the *fullwidth* class, then it uses the whole available
+    horizontal space.
+
 # Usage
 
 ## Default behavior

docs/manuals/gui/viselements/file_selector.md_template

@@ -7,6 +7,14 @@ The upload can be triggered by pressing a button, or drag-and-dropping a file on
 All the file selector controls are generated with the "taipy-file_selector" CSS class. You can use this class
 name to select the file selector controls on your page and apply style.
 
+### [Stylekit](../styling/stylekit.md) support
+
+The [Stylekit](../styling/stylekit.md) provides a specific class that you can use to style file selectors:
+
+* *fullwidth*<br/>
+    If a file selector uses the *fullwidth* class, then it uses the whole available
+    horizontal space.
+
 # Usage
 
 ## Default behavior