Take note: this only works if your browser is in Chrome. It won’t work if you’re using Firefox or Microsoft.
Launch Chrome and head over to the far right corner of the browser and then click the icon with three dots. This will reveal a drop-down menu. Click Settings at the bottom.
Once in your settings, head to the Appearance section. There you will find Open Chrome Web Store under Themes. Click that option.
From here, scroll through the themes and choose the one you would like! Once you choose a theme, click Add to Chrome.
Enjoy your new theme!
Want to add your own background image instead?
Open a new tab and click on the Customize button on the lower right hand corner of the page. Then click Upload an image.