If You need an empty inline span (-s) to have a width and height (for background image or something else) then there is a fix for that.

html {overflow-y: scroll !important;}

css: resize: none;

Most sites include a number of css and JavaScript files. Whilst developing it's usually easier to manage them as separate files but on a live site it makes sense to merge files to reduce the number of HTTP requests the browser has to make. For JavaScript this is particularly important as browsers block rendering whilst downloading.

Because of the wide range of settings and equipment that people might be using to access the World Wide Web, there is no “best font size“. Font sizes should be specified using relative units like percentage or EM, (in external css files) since these will allow the user to adjust font sizes up or down to suit their own requirements. Avoid using graphics of text, as this locks the text size, and makes it impossible for users to change it.

25 Rounded Corners Techniques with css

css and round corners: Borders with curves

Tables used for page setting have always been a bad idea. However, using correctly layers (div tags) will soon become a must.
Visual HTML editors use only a small part of layers possibilities, which often makes them not compatible and not easy to use.
Here is how to position css elements for best results.