You can modify mostly everything you can see in the program by CSS.
If you are familiar with CSS you can set your own visual look of the program by writing a CSS-Stylesheet.
The DatabaseExplorer offers some Stylesheets/Themes which you can modify like you want or writing your own one.
A lot of components have their own ID to edit them directly like #sql_editor or #alertDialog.
For a complete list of all IDs take a look at the Documentation.
