Readme update

Author: tomteipl

README.md

@@ -90,7 +90,7 @@ theme picked from the *Change theme* button.
 **NEW FEATURE**: In theme selection window, now you
 have a new **dropdown menu** that shows your custom themes.
 
-![theme button](assets/change_theme_2.png)
+<img src="assets/change_theme_2.png" alt="Change Theme 2" width="600"/>
 
 Or: