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HTML

            
              <!-- GRID -->
<div class="wrapper">
	
	<!-- HEADER -->
	<p class="head">hover on the pictures</p>
	
	<!-- MAIN -->
	
	<!-- BLACK TO INVERT -->
	<div class="div black invert">
		<button><div></div></button>
		<p>black to <span>white</span></p>
	</div>
	<!-- BLACK TO COLOR -->
	<div class="div black color">
		<button><div></div></button>
		<p>black to <span>color</span>*</p>
	</div>
	
	<!-- WHITE TO INVERT -->
	<div class="div white invert">
		<button><div></div></button>
		<p>white to <span>black</span></p>
	</div>
	<!-- WHITE TO COLOR -->
	<div class="div white color">
		<button><div></div></button>
		<p>white to <span>color</span>*</p>
	</div>
	
	<!-- FOOTER -->
	<p class="foot">*Please, consider playing with the <span>$bg-color</span> and the <span>$color</span> in the CSS.  Changing to some colors will require more adjustements to work properly.</p>
	
</div>
<!-- THE END -->
!

CSS

            
              @import url("https://fonts.googleapis.com/css?family=Lato")
@import "susy"
@import "breakpoint"
	
//== SETUP ==================================================
$bg: teal

@mixin hover($c)
	border: solid 1px $c
	background-color: fade-out($c, 0.8)

//===========================================================
//== WHITE TO COLOR ========================================
//===========================================================

$icon-white: red 
white-span
	color: $icon-white
white
	@include hover($icon-white)
	&::before, &::after
		//-- for white you need to get the opposite color -------
		background: invert($icon-white)
//-----------------------------------------------------------

//-- UNCOMMENT TO TRY OTHER COLORS AND ADJUSTMENT -----------

//-- exemple with pink ------------------------------------
//$icon-white-adjust: pink //-- change & see below
//white-adjust-span
//	color: $icon-white-adjust
//white-adjust
//	@include hover($icon-white-adjust)
//	&::after
//		background: invert($icon-white-adjust)		
//	&::before
//		background: adjust-color($bg, $lightness: 12.3%, $hue: -3)
//		mix-blend-mode: normal
//-----------------------------------------------------------

//-- exemple with goldenrod -------------------------------
//$icon-white-adjust: goldenrod //-- change & see below
//white-adjust-span
//	color: $icon-white-adjust
//white-adjust
//	@include hover($icon-white-adjust)
//	&::after
//		background: invert($icon-white-adjust)		
//	&::before
//		background: adjust-color($bg, $hue: -38, $saturation: -30, $lightness: 25.5)
//		mix-blend-mode: normal
//-----------------------------------------------------------

//===========================================================
//== BLACK to COLOR ========================================
//===========================================================

$icon-black: red
black-span
	color: $icon-black
black
	@include hover($icon-black)
	&::before, &::after
		background: $icon-black
//-----------------------------------------------------------

//-- uncomment this section to check the adjustments --------
$icon-black-adjust: goldenrod
//black-adjust-span
//	color: $icon-black-adjust
//black-adjust
//	@include hover($icon-black-adjust)
//	&::before
//		background: change-color($bg, $hue: 295, $lightness: 84.5%)
//		mix-blend-mode: difference
//	&::after
//		background: $icon-black-adjust
//-----------------------------------------------------------

//===========================================================
//== IMAGES STYLING =========================================
//===========================================================

//== BLACK ==================================================
.black
	color: black
	button
		@include hover(black)
		div
			background: url("https://upload.wikimedia.org/wikipedia/commons/b/b9/FP_Mushroom_icon.svg") center no-repeat
			background-size: contain

//-- TO INVERT ----------------------------------------------
.black.invert
	span
		color: white
	button
		&:hover
			@include hover(white)
			&::before, &::after
				background-color: white

//-- TO COLOR -----------------------------------------------
.black.color
	span
		@extend black-span
		@extend black-adjust-span !optional
	button
		&:hover
			@extend black
			@extend black-adjust !optional
//-----------------------------------------------------------

//== WHITE ==================================================

.white
	color: white
	button
		@include hover(white)
		div
			background: url(https://upload.wikimedia.org/wikipedia/commons/d/db/Sun_white_icon.svg) center no-repeat
			background-size: contain

//-- TO INVERT ----------------------------------------------
.white.invert
	span
		color: black
	button
		&:hover
			@include hover(black)
			&::before, &::after
				//-- for white you need the opposite color ---------
				background-color: white

//-- TO COLOR -----------------------------------------------
.white.color
	span
		@extend white-span
		@extend white-adjust-span !optional
	button
		&:hover
			@extend white
			@extend white-adjust !optional
//-----------------------------------------------------------


//===========================================================
//== RESPONSIVE GRID SUZY+BREAKPOINT========================
//===========================================================

$bp0: 0px
$bp1: 450px
$bp2: 600px
$bp3: 800px
$bp4: 1000px

$susy: (gutters: 1/4, gutter-position: split)
//-----------------------------------------------------------

.wrapper
	width: 90%
	@include breakpoint($bp0)
		min-width: (0.9*$bp1)
	@include breakpoint($bp1)
		max-width: (0.8*$bp2)
	@include breakpoint($bp2)
		max-width: (0.6*$bp3)
	@include breakpoint($bp3)
		max-width: (0.9*$bp4)
//-----------------------------------------------------------
		
.foot
	@include span(100%)
	@include breakpoint($bp0)
		font-size: 10px
	@include breakpoint($bp1)
		font-size: 11px
	@include breakpoint($bp2)
		font-size: 12px
	@include breakpoint($bp3)
		font-size: 14px
	@include breakpoint($bp4)
		font-size: 16px
//-----------------------------------------------------------

.head
	@include span(100%)
	@include breakpoint($bp0)
		font-size: 24px
		margin: 5% 0
	@include breakpoint($bp1)
		font-size: 26px
		margin: 3% 0
	@include breakpoint($bp2)
		font-size: 30px
		margin: 3% 0
	@include breakpoint($bp3)
		font-size: 36px
		margin: 5% 0
//-----------------------------------------------------------
	
.div
	@include span(1 of 2)
	@include breakpoint($bp0)
		font-size: 13px
	@include breakpoint($bp1)
		font-size: 14px
	@include breakpoint($bp2)
		font-size: 15px
	@include breakpoint($bp3)
		font-size: 16px
		@include span(1 of 4)
		margin-bottom: gutter(4)

//===========================================================
//== GENERAL STYLING =======================================
//===========================================================

html, body
	height: 100%
	width: 100%
	background-color: $bg
	font-family: 'Lato', sans-serif
	text-transform: uppercase
	text-align: center
	.wrapper
		height: 100%
		margin: 0 auto
		position: relative
		.head
			font-weight: bold
			text-shadow: -1px -1px lighten($bg, 16%), -1px 0 lighten($bg, 10%), 0 -1px lighten($bg, 10%), 1px 0 darken($bg, 10%), 1px 1px darken($bg, 16%), 0 1px darken($bg, 10%)
			color: lighten($bg, 4%)
			letter-spacing: 4px
		.div
			position: relative
			&::before
				padding-top: 100%
				display: block
				content: ""
			p
				position: absolute
				bottom: 0
				left: 0
				width: 100%
			button
				position: absolute
				top: 0
				left: 10%
				cursor: pointer
				width: 80%
				height: 75%
				padding: 10% 0
				div
					height: 100%
					position: relative
				&::after, &::before
					mix-blend-mode: difference
					position: absolute
					top: 0
					left: 0
					width: 100%
					height: 100%
					content: ""
	.foot
		span
			font-weight: bold
	
//== THE END ================================================
!

JS

            
              //        Please let me know
//          if it's useful
//    or if you have suggestions
//         to improve it! :)
!
999px
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