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//max-width: 1200px の場合
//max-width: 600px の場合
//max-width: 300px の場合

//なぜならmax-width: xはブラウザ幅が「xまでは」

$breakPoint1: 1200px
$breakPoint2: 600px
$breakPoint3: 300px

@mixin maxScreen($breakPoint)
	@media screen and (max-width: $breakPoint)
		//ここにdisplay: none が入る

	background-color: red

	@include maxScreen($breakPoint1)
		background-color: green
	@include maxScreen($breakPoint2)
		background-color: blue
	@include maxScreen($breakPoint3)
		display: none
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