日常Bug | This selector doesn't have any properties and won't be rendered.

报错场景还原：

.box3
    width:100px
    height:100px
    background-color:hotpink

在webpack打包过程中，警告如下： This selector doesn't have any properties and won't be rendered.

报错问题及解决方法： Sass写法，冒号:后面需要一个空格。 修改后，再打包，警告消失。