If you are not a fan of the default admin color schemes provided by WordPress and at the same time you don’t want to use heavy plugins which will enable you to change virtually anything, you can install a lightweight plugin from the WordPress Core team themselves.
By default you only have such choice:
Login into your WordPress dashboard and go to plugins / add new
In the search box on the right hand side wnter that you are looking for admin color schemes.
Now just click on the Install Now button and after couple of seconds when it’s state will change, click Activate.
Now you have a much larger choice of admin color schemes and your WordPress is still lightweight and snappy.
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