Style enhancment suggestions

[OverDriveGain]

I noticed that although the file: Style.qml has the colors defined, not all components use these variables. Also, there exist a standard way in QML for defining themes in this document

Additionally, I suggest adding typography for having a unified size of texts.

[layters]

Thank you for the suggestions. I'm open to any alternative methods that will improve the quality of the code. Also I'm a total Qt/QML noob so I can't say that my way is better hehe.