僕がネイティブなCSS変数にわくわくする理由
https://terkel.github.io/why-im-excited-about-native-css-variables/ あ、ついでに追記 How do I apply opacity to a CSS color variable? – Stack Overflow
https://stackoverflow.com/questions/40010597/how-do-i-apply-opacity-to-a-css-color-variable
https://terkel.github.io/why-im-excited-about-native-css-variables/ あ、ついでに追記 How do I apply opacity to a CSS color variable? – Stack Overflow
https://stackoverflow.com/questions/40010597/how-do-i-apply-opacity-to-a-css-color-variable