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How to Change a Background Dynamically in a Website. Using CSS and JavaScript, you can dynamically change the background on your website.
One way to add a background photo to any custom Tumblr theme is to embed a simple CSS tag at the right location in the theme's HTML code.
What to Know Place a figure tag around the image. Within that, add your caption in the figcaption tag. Optionally, add some CSS to spruce up the caption with its own background and colors.