Your Tumblr theme sets the background color of each ... CSS": Replace "yellow" with the specific color that you want to apply or with the color's HTML code. Click "Update Preview" and "Save ...

For example, you can edit the color of your background and change the header ... can also insert additional code to further customize your background using the Edit HTML tool, making basic changes ...

One example is the option to change ... or color, you can also select a more tailored one by choosing "Custom" from the drop-down under "Page Color." You can input an HTML color code, for example ...