Using custom CSS, you can add a colored background to your posts without editing your posts in other ways and without changing the background of the rest of your blog's body. Log in to Tumblr and ...

Key Takeaways Start with basic concepts like selectors, properties, and box model before moving to layouts.Use online tools ...

Add a short CSS class to an HTML Web page to use animated and stationary GIF images as the page's background. ... Give the background color by adding "background-color:colorName" to the CSS code.