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HTML

              
                <div class="box font2">box</div>

              
            
!

CSS

              
                //変数の宣言と代入
//$変数名 = 値 ではないので注意
//$変数名: 値とすること
//また値にはあくまでCSSの単位付きのものを入れること
//正: 20px 100% Helvetica, sans-serif
//誤: 20   100 "Helvetica, sans-serif"
$height: 200px

.box
	background-color: red
	//使うときは変数名をそのまま入れればよい
	height: $height

//@mixinと@includeはセットで用いられる
//@mixinで関数を生成して、@includeで呼び出すイメージ

//let width = (width) => {width: width}みたいな
@mixin width-calculate($width)
	width: $width * 2

.box
	//width(100px)みたいな
	@include width-calculate(100px)

//@extend
//あるセレクタに指定したスタイルを継承する
.font
	font-family: Helvetica, sans-serif
	font-size: 40px
//.font2は.fontを継承する
.font2
	@extend .font

//結果的にこうなる
//.font2
//	font-family: Helvetica, sans-serif
//	font-size: 40px
              
            
!

JS

              
                
              
            
!
999px

Console