The default theme allows you to change only the color of the headings of windows, toolbars and the Start menu. However, all other elements remain unchanged.
If you want more serious transformations, you should include one of the contrasting themes. They are located at the address “Control Panel” → “All Control Panel Items” → “Personalization”.
After activating one of the contrasting themes, you need to customize it according to your preferences. To do this, enter the following address in the “Explorer” line and press “Enter”:
C: \ Windows \ System32 \ rundll32.exe shell32.dll, Control_RunDLL desk.cpl, Advanced, @ advanced
As a result of this action, a window for fine-tuning the display of the contrast theme chosen by you will open before you. There are many options available, including the background and text color in applications, the kind of buttons, the coloring of window titles.
After detailed adjustment of all parameters you will get an easy and stylish theme that contains exactly the colors that you like. At me, for example, it turned out like this:
So you can create several different themes and switch between them in one mouse click. For example, at the usual time of the day to use a light topic, and when it gets dark, switch to the dark one.
If you do not want to understand the settings yourself, you can search the web for ready-made themes of contrast mode. Here, for example, there is a gray, but a black one.