I am attempting to construct a roll-over pop-up box via HTML and CSS. The box is rectagular with an arrow sticking off the left side of it. It needs to scale height based on how much content is in ...

Add a short CSS class to an HTML Web page to use animated and stationary GIF images as the page's background.

Google says images styled with CSS won’t be indexed in Image Search, advising developers to use HTML tags for important visuals.

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.