How to change your Tumblr Theme Background
This Tumblr background tutorial should work for most if not all themes on Tumblr. First, click customize. You should now see a navigation panel above your Tumblr blog. Click Theme. You should now see a bunch of codes.

Go through the script and look for the body CSS tag (easier if you use ctrl + f). You are looking to change the background elements in the parentheses. Remove all background elements within the body tag and use the follow instructions to design different types of backgrounds.
Solid color background
Add “background:#XXX;” and change XXX with the color hex code of your choice. You can use this website to find an appropriate color.
Repeating image background
Add “background: url(‘XXX’);” and replace XXX with the image URL.
One image with color background
Add “background:#XXX;” and replace XXX with a color hex code of your choice.
Add “background-image:url(XXX);” and replace XXX with the image URL.
Add “background-repeat:no-repeat;”
Add “background-attachment:fixed;”
Add “background-position:XXX YYY;” and replace XXX with the following:left,center,right. Replace YYY with:top,center,bottom.
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