TryHTML is a WYSIWYG web page builder with plenty of built-in HTML and CSS examples.
TryHTML can also convert images to Base64 and vice versa and even get the source code of a web page by entering the URL. You can also get any color in RGB with the color picker.
Whether you want to learn HTML, or just get it done, TryHTML is an excellent way to get started. As far as we know, it's also the smallest WYSIWYG editor out there.