title: Website Background color change
body: <p>I want to know how can I change the color of my website when the I select a different color. For example, the background of my website is white and if I choose black, my websites background color changes to black. I have applied the CSS, but the changes are not reflected in all the pages. On which ever page I am clicking as the color theme black, the color of that particular page gets changed. Rest all the pages remain white. Can you please tell me how can I change the background color of the whole website on button click.</p>