[CSS/Sass] 一些規範文、 Sass 技巧

https://cssguidelin.es/#the-importance-of-a-styleguide

https://sass-guidelin.es/#syntax--formatting

你可能不知道的 Sass 技巧 - 愷開 medium
10 Sass (SCSS) mixins you should be using in your projects - engageinteractive.co.uk