element { border: 1px solid color(black alpha(50%)); } It currently throws: $color: 50% is not a color for `alpha' Now, I don't expect Sass to do anything with this, as that's the job of a post-...

A serious web designer/developer must call for a skill to write good CSS. CSS is simple, very easy to learn but very powerful language…

The children flex properties can be applied at child level, separate for each child. See the results...

An extensive CSS reference with all the important properties and info to learn CSS from the basics