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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <body class="red-and-black">
	
	<!-- Featured Image	 -->
	
	<h2>Featured image</h2>
	<div class="js-module u-flex u-width-600 u-margin-t-40">
		<div class="site-featured-image u-width-600">
			<figure class="post-thumbnail a-filter-child-img">
				<img src="http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-1568x701.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" srcset="http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-1568x701.jpg 1568w, http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-580x259.jpg 580w, http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-1400x626.jpg 1400w, http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-768x343.jpg 768w, http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-1536x687.jpg 1536w, http://localhost/c4aa/wp-content/uploads/2020/02/IMG_6019-2048x915.jpg 2048w" sizes="(max-width: 1568px) 100vw, 1568px" width="1568" height="701">					
			</figure>
			<div class="entry-header">		
				<h1 class="entry-title">image filters test</h1>
			</div><!-- .entry-header -->
		</div>
		<div class="js-button-container u-flex u-flex-direction-column">
			<button class="beige-and-red">beige-and-red</button>
			<button class="red-and-black">red-and-black</button>
			<button class="beige-and-black">beige-and-black</button>
			<button class="beige-and-grey">beige-and-grey</button>
			<button class="beige-and-grey-vintage">beige-and-grey-vintage</button>
</div>
	</div>
	
	
	<!-- Image Block	 -->
	
	<h2>Inline block images</h2>
	<div class="js-module u-width-600 u-flex">
		<div class="a-filter-child-img">
			<img src="https://live.staticflickr.com/1960/45670544451_05dbf59644_n.jpg" alt="">
		</div>
		<div class="js-button-container u-flex u-flex-direction-column">
			<button class="beige-and-red">beige-and-red</button>
			<button class="red-and-black">red-and-black</button>
		<button class="beige-and-black">beige-and-black</button>
			<button class="beige-and-grey">beige-and-grey</button>
			<button class="beige-and-grey-vintage">beige-and-grey-vintage</button>
		</div>
	</div>
	<div class="js-module u-width-600 u-flex u-margin-t-40">
		<div class="a-filter-child-img">
			<img src="https://live.staticflickr.com/4754/26537562208_100527f564.jpg" alt="">
		</div>
		<div class="js-button-container u-flex u-flex-direction-column">
			<button class="beige-and-red">beige-and-red</button>
			<button class="red-and-black">red-and-black</button>
		<button class="beige-and-black">beige-and-black</button>
			<button class="beige-and-grey">beige-and-grey</button>
			<button class="beige-and-grey-vintage">beige-and-grey-vintage</button>
		</div>
	</div>

	
	<!-- Cover Block	 -->

	<h2>WP cover block</h2>
	<div class="js-module u-flex u-width-600 u-margin-t-40">
		<div class="a-filter-cover-img wp-block-cover has-background-dim-30 has-background-dim" style="background-image:url(http://backtobasics.c4aa.org/wp-content/uploads/2019/05/NYC_Brooklyn_Musum_OSF_Arts_Exchange_SCA_2NYC_Met_Museum_NY_OSF_SCA_201804-8381.jpg)"><div class="wp-block-cover__inner-container">
		<p class="has-text-align-center has-huge-font-size"> The C4AA offers training, advising, research, and resources.</p>
	</div>	
		
	</div>
		<div class="js-button-container u-flex u-flex-direction-column">
			<button class="beige-and-red">beige-and-red</button>
			<button class="red-and-black">red-and-black</button>
		<button class="beige-and-black">beige-and-black</button>
			<button class="beige-and-grey">beige-and-grey</button>
			<button class="beige-and-grey-vintage">beige-and-grey-vintage</button>
		</div>
	</div>
</body>
              
            
!

CSS

              
                
/* Duotone Defaults */
:root {
	--color-brandBeige: #f2f1ed; /* Fallback */
	--color-brandBeige: hsla(48, 16%, 94%, 1);
	--color-brandBlack: #292724; /* Fallback */
	--color-brandBlack: hsla(36, 6%, 5%, 0.9);
	--color-brandBlue: #005eb8; /* Fallback */
	--color-brandBlue: hsla(209, 100%, 34%, 0.9);
	--color-brandGrey: #7b736c; /* Fallback */
	--color-brandGrey: hsla(28, 6%, 42%, 0.9);
	--color-brandRed: #da2f3b; /* Fallback */
	--color-brandRed: hsla(356, 80%, 45%, 0.9);
	--color-brandWhite: #fafaf9; /* Fallback */
	--color-brandWhite: hsla(60, 9%, 98%, 0.9);
	--color-brandYellow: #e1cd00; /* Fallback */
	--color-brandYellow: hsla(55, 100%, 46%, 0.9);

	/* Default Colors */
	--duotone-default-base: var(--color-brandBeige);
	--duotone-default-foreground: var(--color-brandRed);

	/* Default Image Treatment */
	--duotone-base: var(--duotone-default-base);
	--duotone-bg-blend: multiply;
	--duotone-blur: 0px;
	--duotone-fg-blend: screen;
	--duotone-foreground: var(--duotone-default-foreground);
	--duotone-opacity: 1;
	--duotone-spacing: 1%;
}

.a-filter-child-img {
	background-color: var(--duotone-base);
	overflow: hidden;
	padding: var(--duotone-spacing);
	position: relative;
	transition: background-color 250ms ease;
}

.a-filter-child-img img {
	filter: grayscale(100%) contrast(1) blur(var(--duotone-blur));
	mix-blend-mode: var(--duotone-bg-blend);
	object-fit: cover;
	opacity: var(--duotone-opacity);
	position: relative;
	width: 100%;
	transition: mix-blend-mode filter opacity 250ms ease-in-out;
}

.a-filter-child-img::before {
	background-color: var(--duotone-foreground);
	bottom: 0;
	content: "";
	height: 100%;
	left: 0;
	mix-blend-mode: var(--duotone-fg-blend);
	position: absolute;
	right: 0;
	top: 0;
	width: 100%;
	z-index: 1;
}

/* Hover state */

.a-filter-child-img:hover {
	background-color: initial;
	opacity: 1;
}

.a-filter-child-img:hover::before {
	background-color: initial;
}

.a-filter-child-img:hover img {
	filter: none;
	mix-blend-mode: normal;
	opacity: 1;
}

/* Themes */

.red-and-black {
	--duotone-base: var(--color-brandRed);
	--duotone-foreground: var(--color-brandBlack);
	--duotone-bg-blend: multiply;
	--duotone-fg-blend: screen;
	--duotone-opacity: 0.96;
}

.beige-and-black {
	--duotone-base: var(--color-brandBeige);
	--duotone-foreground: var(--color-brandBlack);
	--duotone-bg-blend: multiply;
	--duotone-fg-blend: lighten;
	--duotone-opacity: 1;
}

.beige-and-red {
	--duotone-base: var(--color-brandBeige);
	--duotone-foreground: var(--color-brandRed);
	--duotone-bg-blend: multiply;
	--duotone-fg-blend: screen;
	--duotone-opacity: 1;
}

.beige-and-grey {
	--duotone-base: var(--color-brandBeige);
	--duotone-foreground: var(--color-brandGrey);
	--duotone-bg-blend: multiply;
	--duotone-fg-blend: screen;
	--duotone-opacity: 1;
}

.beige-and-grey-vintage {
	--duotone-base: var(--color-brandBeige);
	--duotone-foreground: var(--color-brandBlack);
	--duotone-bg-blend: color-burn;
	--duotone-fg-blend: screen;
	--duotone-opacity: 0.69;
}

/* Utils */

button {
	white-space: nowrap;
}

.u-width-600 {
	width: 600px;
}

.u-flex {
	display: flex;
}

.u-flex-direction-column {
	flex-direction: column;
}

.u-margin-t-40 {
	margin-top: 40px;
}

/* Basic WP cover block styles */

.wp-block-cover {
	background-attachment: fixed;
	color: white;
}

.wp-block-cover.has-background-dim::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	bottom: 0;
	right: 0;
	background-color: inherit;
	opacity: 0.5;
	z-index: 1;	
}

.wp-block-cover__inner-container {
	z-index: 1;	
}

.wp-block-cover {
	background-color: #000;
	position: relative;
	background-size: cover;
	background-position: 50%;
	min-height: 430px;
	width: 100%;
	margin: 0 0 1.5em;
	display: flex;
	justify-content: center;
	align-items: center;
	overflow: hidden;
}

.a-filter-cover-img {
	background-color: var( --duotone-base );
	background-blend-mode: var( --duotone-bg-blend );
/* 	Could do stuff like this: */
/* 	filter: grayscale(30%) sepia(30%) contrast(2) brightness(1.5); */
}

.a-filter-cover-img::before {
	background-color: var( --duotone-foreground ) !important;
}


/* Misc */

img {
	max-width: 100%;
	height: auto;
}
              
            
!

JS

              
                document.querySelectorAll( '.js-module' ).forEach( ( el ) => {
	let btnListener = el.querySelector( '.js-button-container' );

	btnListener.addEventListener( 'click', ( e ) => {
		
		if ( e.target.nodeName == 'BUTTON' ) {
			if ( el.querySelector( '.a-filter-child-img' ) ) {
				el.querySelector( '.a-filter-child-img' ).setAttribute( 'class', 'a-filter-child-img ' + e.target.textContent );
			}
			
			if ( el.querySelector( '.a-filter-cover-img' ) ) {
				el.querySelector( '.a-filter-cover-img' ).setAttribute( 'class', 'wp-block-cover wp-block-cover has-background-dim a-filter-cover-img ' + e.target.textContent );
			}
		}
	});
})
              
            
!
999px

Console