The background color of all windows on the computer will change.

Right-click anywhere on the desktop, and then click Properties. After that, you will see a line at the top: theme, desktop, screen saver, appearance, settings.

Then you click Appearance ~ There are: 1, windows and buttons, where you can choose the shapes of windows and buttons you like.

2, color matching, here you can choose your favorite color.

3, font size, as you know here, you can choose the font size.

That's how I changed it ~ I don't know if you can change it to what you like! ~