By default, WordPress comes with eight different color schemes for the admin panel: Dark(Default), Light, Blue, Coffee, Ectoplasm, Midnight, Ocean, Sunrise.
To change the color of your WordPress admin area:
1. On the left side menu, click on Users then Profile.
2. On the profile edit page, you will see the eight color schemes. Choose the color scheme you want by checking the radio button next to the color name.